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A swimming pool, swimming bath, wading pool, or paddling pool is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground (in-ground pools) or built above ground (spil a freestanding construction or spil part of a building or other larger structure), and are also a common feature aboard ocean-liners and cruise ships. In-ground pools are most commonly constructed from materials such spil concrete, natural stone, metal, plastic or fiberglass, and can be of a custom-built size and form or built to a standardized size, the largest of which is the Olympic-size swimming pool.
Many health clubs, fitness centers and private clubs, such spil the YMCA, have pools used mostly for exercise or recreation. Many towns and cities provide public pools. Many hotels have pools available for their guests to use at their leisure. Educational facilities such spil universities typically have pools for physical education classes, recreational activities, leisure or competitive athletics such spil swimming teams. Hot tubs and spas are pools packed with hot water, used for refreshment or hydrotherapy, and are common ter homes, hotels, and health clubs. Special swimming pools are also used for diving, specialized water sports, physical therapy spil well spil for the training of lifeguards and astronauts. Swimming pools may be heated or unheated.
The “Superb Bath” at the webpagina of Mohenjo-Daro ter modern-day Pakistan wasgoed most likely the very first swimming pool, dug during the 3rd millennium BC. This pool is 12 by 7 metres (39 by 23 feet), is lined with bricks, and wasgoed covered with a tar-based sealant. 
Ancient Greeks and Romans built artificial pools for athletic training te the palaestras, for nautical games and for military exercises. Roman emperors had private swimming pools ter which fish were also kept, hence one of the Latin words for a pool wasgoed piscina. The very first heated swimming pool wasgoed built by Gaius Maecenas of Rome te the 1st century BC. Gaius Maecenas wasgoed a rich Roman lord and considered one of the very first patrons of medicus. [Two]
Ancient Sinhalese built pairs of pools called “Kuttam Pokuna” ter the kingdom of Anuradhapura, Sri Lanka te the 4th century BC. They were decorated with flights of steps, punkalas or pots of abundance, and scroll vormgeving. [Three]
19th century Edit
Swimming pools became popular te Britain te the mid-19th century. Spil early spil 1837, six indoor pools with diving boards existed ter London, England. [Four] The Maidstone Swimming Club ter Maidstone, Weet is believed to be the oldest surviving swimming club ter Britain. It wasgoed formed te 1844, ter response to concerns overheen drownings te the Sea Medway, especially since would-be rescuers would often drown because they themselves could not swim to safety. The club used to swim ter the Sea Medway, and would hold races, diving competitions and water polo matches. The South East Gazette July 1844 reported an aquatic breakfast party: coffee and biscuits were served on a floating raft ter the sea. The coffee wasgoed kept hot overheen a fire, club members had to tread water and drink coffee at the same time. The last swimmers managed to overturn the raft, to the vertier of 150 spectators. [Five]
The Inexperienced Swimming Association wasgoed founded ter 1869 te England,  and the Oxford Swimming Club te 1909.  The presence of indoor baths ter the cobbled area of Merton Street might have persuaded the less hardy of the aquatic brigade to join. So, bathers step by step became swimmers, and bathing pools became swimming pools. [ citation needed ] . Te 1939, Oxford created its very first major public indoor pool at Temple Cowley.
The modern Olympic Games embarked te 1896 and included swimming races, after which the popularity of swimming pools began to spread. Te the US, the Racquet Club of Philadelphia clubhouse (1907) boasts one of the world’s very first modern above-ground swimming pools. The very first swimming pool to go to sea on an ocean liner wasgoed installed on the White Strak Line’s Adriatic te 1906.  The oldest known public swimming pool ter America, Underwood Pool, is located ter Belmont, Massachusetts. 
Rente ter competitive swimming grew following World War I. Standards improved and training became essential. Huis swimming pools became popular te the United States after World War II and the publicity given to swimming sports by Hollywood films such spil Esther Williams’ Million Dollar Mermaid made a huis pool a desirable status symbol. More than 50 years straks, the huis or residential swimming pool is a common glance. Some petite nations love a thriving swimming pool industry (e.g., Fresh Zealand speelgoedpop. Four,116,900 [Source NZ Census 7 March 2006] – holds the record ter pools vanaf capita with 65,000 huis swimming pools and 125,000 spawater pools). [ citation needed ]
A two-storey, white concrete swimming pool building composed of horizontal cubic volumes built ter 1959 at the Royal Roads Military Collegium is on the Registry of Historic Places of Canada. [Ten]
World records Edit
According to the Guinness World Records, the largest swimming pool te the world is San Alfonso del Mar Seawater pool te Algarrobo, Chile. It is 1,013 m (Three,323 ft) long and has an area of 8 hectare (20 acres). At its deepest, it is Three.Five m (11 ft) deep.  It wasgoed finished ter December 2006. 
The largest indoor wave pool ter North America is at the Westelijk Edmonton Mall and the largest indoor pool is at the Neutral Buoyancy Laboratorium te the Sonny Carter Training Facility at NASA JSC te Houston.  
Ter 2014, the Y-40 swimming pool at the Hotel Terme Millepini ter Padua, Italy became the deepest indoor pool, certified by the Guinness Book of World Records  The recreational diving center Nemo 33 near Brussels, Belgium previously held the record until the Y-40 wasgoed finished. 
The Fleishhacker Pool te San Francisco wasgoed the largest heated outdoor swimming pool ter the United States. Opened on 23 April 1925, it measured 1,000 by 150 ft (300 by 50 m) and wasgoed so large that the lifeguards required kayaks for patrol. It wasgoed closed ter 1971 due to low patronage. 
Ter Europe, the largest swimming pool opened te 1934 ter Elbląg (Poland), providing a water area of 33,500 square metres (361,000 sq ft). [Legitimate]
One of the largest swimming pools everzwijn built wasgoed reputedly created ter Moscow after the Palace of Soviets remained uncompleted. The foundations of the palace were converted into the Moskva Pool open-air swimming pool after the process of de-Stalinisation. [Nineteen] However, after the fall of communism, Christ the Saviour Cathedral wasgoed re-built on the webpagina inbetween 1995 and 2000, the cathedral had originally bot located there. [ citation needed ]
The highest swimming pool is believed to be te Yangbajain (Tibet, China). This resort is located at 4200 m AMSL and has two indoor swimming pools and one outdoor swimming pool, all packed with water from hot springs. 
Length: Most pools te the world are measured ter metres, but ter the United States pools are often measured ter feet and yards. Ter the UK most pools are calibrated te metres, but older pools measured ter yards still exist. Ter the US, pools tend to either be 25 yards (SCY-short course yards), 25 metres (SCM-short course metres) or 50 metres (long course). US high schools and the NCAA conduct brief course (25 yards) competition. There are also many pools 33⅓ m long, so that Trio lengths = 100 m. This pool dimension is commonly used to accommodate water polo. [ citation needed ]
USA Swimming (USA-S) swims te both metric and non-metric pools. However, the international standard is metres, and world records are only recognized when swum ter 50 m pools (or 25 m for brief course) but 25-yard pools are very common ter the US. Te general, the shorter the pool, the quicker the time for the same distance, since the swimmer gains speed from pushing off the wall after each turn at the end of the pool.
Width: Most European pools are inbetween Ten m and 50 m broad. [ citation needed ]
Depth: The depth of a swimming pool depends on the purpose of the pool, and whether it is open to the public or stringently for private use. If it is a private casual, calming pool, it may go from 1.0 to Two.0 m (Trio.Trio to 6.6 ft) deep. If it is a public pool designed for diving, it may slope from Trio.0 to Five.Five m (Ten to Eighteen ft) te the deep end. A children’s play pool may be from 0.Three to 1.Two m (1 to Four ft) deep. Most public pools have differing innards to accommodate different swimmer requirements. Ter many jurisdictions, it is a requirement to display the water depth with clearly marked innards affixed to the pool walls. [ citation needed ]
Pools can be either indoors or outdoors. They can be of any size and form, and inground or above ground. Most pools are voortdurend fixtures, while others are makeshift, collapsible structures.
Private pools Edit
Private pools are usually smaller than public pools, on average Trio.7 m × 7.Trio m (12 ft × 24 ft) to 6.1 m × 12.Two m (20 ft × 40 ft) whereas public pools usually commence at 24 m (80 ft). [ citation needed ] Huis pools can be permanently built-in, or be assembled above ground and disassembled after summer.  Privately wielded outdoor pools ter backyards or gardens embarked to proliferate te the 1950s ter regions with warm summer climates, particularly ter the United States with desegregation. 
Construction methods for private pools vary greatly. The main types of in-ground pools are gunite shotcrete, concrete, vinyl-lined, and one-piece fiberglass shells.
Many countries now have stringent pool fencing requirements for private swimming pools, which require pool areas to be isolated so that unauthorized children junior than six years cannot come in. Many countries require a similar level of protection for the children residing te or visiting the house, albeit many pool owners choose the visual facet of the pool ter close proximity to their living areas, and will not provide this level of protection. There is no overeenstemming inbetween states or countries on the requirements to fence private swimming pools, and te many places they are not required at all, particularly te rural settings. 
Children’s pools Edit
Inexpensive makeshift polyvinyl chloride pools can be bought te supermarkets and taken down after summer. They are used mostly outdoors ter yards, are typically shallow, and often their sides are inflated with air to stay rigid. When finished, the water and air can be let out and this type of pool can be folded up for convenient storage. They are regarded ter the swimming pool industry spil “splasher” pools intended for cooling off and amusing toddlers and children, not for swimming, hence the alternate name of “kiddie” pools. [ citation needed ]
Fucktoys are available for children and other people to play with ter pool water. They are often deep-throated up with air so they are soft but still reasonably rugged, and can float ter water.
Public pools Edit
Public pools are often part of a larger leisure centre or recreational complicated. Thesis centres often have more than one pool, such spil an indoor heated pool, an outdoor (chlorinated, saltwater or ozonated) pool which may be heated or unheated, a shallower children’s pool, and a paddling pool for toddlers and infants. There may also be a sauna and one or more hot tubs or spawater pools (“jacuzzis”).
Many upscale hotels and holiday resorts have a swimming pool for use by their guests. If a pool is te a separate building, the building may be called a natatorium. The building may sometimes also have facilities for related activities, such spil a diving waterreservoir. Larger pools sometimes have a diving houtvezelplaat affixed at one edge above the water.
Many public swimming pools are rectangles 25 m or 50 m long, but they can be any size and form. There are also elaborate pools with artificial waterfalls, fountains, splash pads, wave machines, varying innards of water, bridges, and island kroegen.
Some swimming facilities have lockers for clothing and other belongings. The lockers can require a coin to be inserted te a slot, either spil deposit or payment. There are usually showers – sometimes mandatory – before and/or after swimming. There are often also lifeguards to ensure the safety of users.
Wading or paddling pools are shallow bods of water intended for use by puny children, usually te parks. Concrete wading pools come te many shapes, traditionally rectangle, square or circle. Some are packed and drained daily due to lack of a filterzakje system. Staff chlorinate the water to ensure health and safety standards. [ citation needed ]
Competition pools Edit
The Fédération Internationale den lade Natation (FINA, International Swimming Federation) sets standards for competition pools: 25 or 50 m (82 or 164 ft) long and at least 1.35 m (Four.Four ft) deep. Competition pools are generally indoors and heated to enable their use all year round, and to more lightly serve with the regulations regarding temperature, lighting, and automatic officiating equipment.
An Olympic-size swimming pool (very first used at the 1924 Olympics) is a pool that meets FINA’s extra standards for the Olympic Games and for world championship events. It voorwaarde be 50 by 25 m (164 by 82 ft) broad, divided into eight lanes of Two.Five m (8.Two ft) each, plus two areas of Two.Five m (8.Two ft) at each side of the pool.  Depth vereiste be at least Two m (6.6 ft).
The water vereiste be kept at 25–28 °C (77–82 °F) and the lighting level at greater than 1500 lux. There are also regulations for color of lane cord, positioning of backstroke flags (Five metres from each wall), and so on. Pools claimed to be “Olympic pools” do not always meet thesis regulations, spil FINA cannot police use of the term. Touchpads are mounted on both walls for long course meets and each end for brief course.
A pool may be referred to spil prompt or slow, depending on its physical layout.  Some vormgeving considerations permit the reduction of swimming resistance making the pool quicker: namely, decent pool depth, elimination of currents, enlargened lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs.
Exercise pools Edit
Te the last two decades, a fresh style of pool has gained popularity. Thesis consist of a petite vessel (usually about Two.Five × Five m) te which the swimmer swims te place, either against the thrust of an artificially generated water current or against the pull of restraining devices. Thesis pools have several names, such spil swim spas, swimming machines, or swim systems. They are all examples of different modes of resistance swimming.
Hot tubs and spawater pools Edit
Hot tubs and spawater pools are common heated pools used for entertainment and sometimes for therapy. Commercial spas are common te the swimming pool area or sauna area of a health club or fitness centre, ter fellows’s clubs, women’s clubs, motels and sensational five-star hotel suites. Spawater clubs may have very large pools, some segmented into enlargening temperatures. Ter Japan, guys’s clubs with many spas of different size and temperature are common. Commercial spas are generally made of concrete, with a mosaic tiled interior. More recently with the innovation of the pre-form composite method where mosaic tiles are bonded to the shell this enables commercial spas to be entirely factory manufactured to specification and delivered te one chunk. Hot tubs are typically made somewhat like a wine barrel with straight sides, from wood such spil Californian redwood held te place by metal hoops. Immersion of the head is not recommended te spas or hot tubs due to a potential risk of underwater entrapment from the pump absorption compels. However, commercial installations te many countries vereiste obey with various safety standards which reduce this risk considerably.
Huis spas are a worldwide retail voorwerp ter western countries since the 1980s, and are sold te dedicated spawater stores, pool shops, department stores, the Internet, and catalog sales books. They are almost always made from heat-extruded acrylic sheet Plexiglas, often colored ter marble look-alike patterns. They infrequently exceed 6 m Two (65 sq ft) and are typically 1 m (Trio ft Three te) deep, restricted by the availability of the raw sheet sizes (typically manufactured ter Japan). There is often a mid-depth seating or lounging system, and contoured lounger style reclining seats are common. Upmarket spas include various jet nozzles (rubdown, pulsating, etc.), a drinks tray, lights, LCD flat-screen TV sets and other features that make the pool a recreation center. Due to their family-oriented nature, huis spas are normally operated from 36 to 39 °C (97 to 102 °F). Many pools are incorporated ter a redwood or simulated wood surround, and are termed “portable” spil they may be placed on a patio rather than sunken into a voortdurend location. Some portable spas are shallow and narrow enough to getraind sideways through a standard onderbrak and be used inwards a slagroom. Low power electrified immersion heaters are common with huis spas.
Whirlpool tubs very first became popular ter America during the 1960s and 1970s. A spawater is also called a “jacuzzi” ter USA since the word became a generic after plumbing component manufacturer Jacuzzi introduced the “spawater whirlpool” ter 1968. Air bubbles may be introduced into the nozzles via an air-bleed venturi pump that combines cooler air with the incoming heated water to cool the pool if the temperature rises awkwardly high. Some spas have a onveranderlijk stream of bubbles fed via the seating area of the pool, or a footwell area. This is more common spil a temperature control device where the heated water comes from a natural (uncontrolled warmth) geothermal source, rather than artificially heated. Water temperature is usually very warm to hot — 38 to 42 °C (100 to 108 °F), so bathers usually stay te for only 20 to 30 minutes. Bromine or mineral sanitizers are often recommended spil sanitizers for spas because chlorine dissipates at a high temperature thereby heightening its strong chemical smell. Ozone is an effective bactericide and is commonly included ter the circulation system with cartridge filtration, but not with sand media filtration due to clogging problems with turbid figure fats.
Ocean pools Edit
Ter the early 20th century, especially te Australia, ocean pools were built, typically on headlands by enclosing part of the rock shelf, with water circulated through the pools by flooding from tidal tanks or by regular flooding overheen the side of the pools at high tide. This continued a pre-European tradition of bathing te rockpools with many of the current sites being expanded from sites used by Aboriginal Australians or early European settlers. Bathing ter thesis pools provided security against both rough surf and sea life. There were often separate pools for women and fellows, or the pool wasgoed open to the sexes at different times with a pauze for bathers to climb ter without fear of observation by the other lovemaking.  Thesis were the forerunners of modern “Olympic” pools. A variation wasgoed the straks development of sea- or harbour-side pools that circulated sea water using pumps. A pool of this type wasgoed the training ground for Australian Olympian Dawn Fraser.
There are presently about 100 ocean baths ter Fresh South Wales, which can range from petite pools harshly 25 metres long and “Olympic Sized” (50m) to the very large, such spil the 50 × 100 m baths te Newcastle. While most are free, a number charge fees, such spil the Bondi Icebergs Club pool at Bondi Beach. Despite the development of chlorinated and heated pools, ocean baths remain a popular form of recreation ter Fresh South Wales.
A semi-natural ocean pool exists on the central coast of Fresh South Wales, it is called The Bogey Crevice.
Infinity pools Edit
An infinity edge pool (also named negative edge or vanishing edge pool) is a swimming pool which produces a visual effect of water extending to the horizon, vanishing, or extending to “infinity”. Often, the water shows up to fall into an ocean, lake, bay, or other similar bod of water. The illusion is most effective whenever there is a significant switch te elevation, however having a natural assets of water on the horizon is not a limiting factor. [ citation needed ]
Natural pools and ponds Edit
Natural pools were developed ter central and western Europe te the early and mid-1980s by designers and landscape architects with environmental concerns. They have recently bot growing ter popularity spil an alternative to traditional swimming pools.  Natural pools are constructed bods of water te which no chemicals or devices that disinfect or sterilize water are used, and all the cleaning of the pool is achieved purely with the mobility of the water through biological filters and plants rooted hydroponically ter the system. Ter essence, natural pools seek to recreate swimming slots and swimmable lakes, the environment where people feel safe swimming ter a non-polluted, healthy, and ecologically balanced bod of water.
Water ter natural pools has many desirable characteristics. For example, crimson eyes, dried-out skin and hair, and bleached bathing suits associated with overly chlorinated water are naturally absent ter natural pools. [ citation needed ] Natural pools, by requiring a water garden to be a part of the system, offerande different aesthetic options and can support amphibious wildlife such spil snails, frogs, and salamanders, and even puny fish if desired.
Zero-entry swimming pools Edit
A zero-entry swimming pool, also called a beach entry swimming pool, is a swimming pool having an edge or entry that step by step slopes from the deck into the water, becoming deeper with each step, te the manner of a natural beach. Spil there are no stairs or ladders to navigate, this type of entry assists older people, youthfull children and people with accessibility problems (e.g., people with a physical disability) where gradual entry is useful.
Indoor Pools Edit
Indoor pools are located inwards, under a roof and insulated by at least three walls. Built for the purpose of year-round swimming or training, they are found te all climate types. Since the pool slagroom is insulated, it is less likely the warmth will escape, making it less expensive to fever than an outdoor pool where the warmth will escape.  Architecturally, the indoor pool may look like the surplus of the house, but te terms of engineering, variables such spil heating and ventilation are required to ensure comfy humidity levels. Te addition to ontwatering and automatic pool covers, there are a number of ways to eliminate humidity te the air that is present with any moist indoor environment.  Efficient dehumidification ter the indoor pool environment prevents structural harm, lowers energy costs te addition to improving the room’s climate to make it a comfy swimming environment. 
Swimming pools are also used for events such spil synchronized swimming, water polo, canoe polo and underwater sports such spil underwater hockey, underwater rugby, finswimming and sport diving spil well spil for training diving, lifesaving and scuba diving technologies. They have also bot used for specialist tasks such spil training water-ditching survival technologies for aircraft and submarine crews and ruimtevaarder training. Round-cornered, irregular swimming pools, such spil the Nude Cup, were drained of water and used for vertical skateboarding.
Levels of bacteria and viruses ter swimming pool water voorwaarde be kept low to prevent the spread of diseases and pathogens. Bacteria, algae and insect larvae can come in the pool if water is not decently sanitized. Pumps, mechanical sand filters, and disinfectants are often used to sanitise the water.
Chemical disinfectants, such spil chlorine (usually spil a hypochlorite salt, such spil calcium hypochlorite) and bromine, are commonly used to kill pathogens. If not decently maintained, chemical sanitation can produce high levels of disinfection byproducts. Sanitized swimming pool water can theoretically show up green if a certain amount of metal salts or copper chloride are present ter the water. 
Acesulfame potassium has bot used to estimate how much urine is discharged by swimmers into a pool.  Te a Canadian probe it wasgoed estimated that swimmers had released 75 litres of urine into a large pool that had about 830,000 litres of water and wasgoed a third of the size of an olympic pool. Hot tubs were found to have higher readings of the marker. While urine itself is sterile, its degradation products may lead to asthma. 
Swimming pool heating costs can be significantly diminished by using a pool voorkant. Use of a pool voorkant also can help reduce the amount of chemicals (chlorine, etc.) required by the pool. Outdoor pools build up fever from the zon, absorbing 75–85% of the solar energy striking the pool surface. Tho’ a voorkant decreases the total amount of solar warmth absorbed by the pool, the voorkant eliminates fever loss due to evaporation and reduces warmth loss at night through its insulating properties. Most swimming pool warmth loss is through evaporation. 
The heating effectiveness of a voorkant depends on type. A semi-transparent bubble voorkant is the most effective, spil it permits the largest amount of solar flux into the pool itself. Thermal bubble covers are lightweight UV-stabilized floating covers designed to minimize fever loss on heated swimming pools. Typically they are only fitted te spring and fall (autumn) when the temperature difference inbetween pool water and air temperature is greatest. They raise the temperature of a pool by around 20 °Fahrenheit, or 11 °Celsius, after being on the pool for a week. Bubble covers are typically applied and liquidated by being flipped up on a device fitted to one side of the pool (see illustration). Covers fall exclusief after four or five years due to zon exposure, overheating ter the zon while off the pool, and chlorine attacking the plastic. Bubble covers should be eliminated during super chlorination.
A vinyl voorkant absorbs more sunlight directly, permitting temperature to rise quicker, but ultimately prevents the pool from reaching spil high a temperature spil a clear voorkant.  Vinyl covers consist of a stronger material and have a longer life expectancy than bubble covers. Insulated vinyl covers are also available with a lean layer of supple insulation sandwiched inbetween two layers of vinyl.  Thesis covers are mandatory [ citation needed ] to be fitted to all pools ter areas of Australia that have experienced drought since 2006. This is an effort to conserve water, spil much water evaporates and transpires.
An alternative to a continuous sheet of pool covering is numerous floating disks which are deployed and liquidated disk by disk. They voorkant most of the surface of the pool and opoffering evaporation reduction similar to continuous covers. Various types are available, for example opaque (for UV resistance and possible diminished algal growth), semi-transparent (for esthetics), intense and solid (for wind resistance), light and inflatable (for ease of treating).
Thesis covers are typically fastened all winter, by hooked bungee ropes or hooked springs connected to the pool deck, and are usually made ter a multitude of materials including glazed or laminated vinyl or polypropylene mesh. They are custom-built designed to zekering leaf debris from injecting the pool but more importantly they also provide safety for animals and puny children when designed and installed decently. The custom-made safety voorkant wasgoed invented ter 1957 by Fred Meyer Jr. of Meyco Pool Covers when he found a dead animal te his pool. Today covers are made to meet ASTM safety barrier standards and have kept animals, people and even large vehicles out of the pool. They are not popular te warmer climates, due to the five to ten minutes it takes to gezond/eliminate them, making them inconvenient for repeated application and removal.
Pool voorkant automation Edit
A pool voorkant can be either by hand, semi-automatically, or automatically operated. Manual covers can be folded and stored ter an off webpagina location. Pool voorkant reels can also be used to help by hand roll up the pool voorkant. The reel, usually on wheels, can be flipped ter or out of place.
Semi-automatic covers use a motor-driven reel system. They use electrical power to roll and unroll the voorkant, but usually require someone to pull on the voorkant when unrolling, or guide the voorkant onto the reel when rolling up the voorkant. Semi-automatic covers can be built into the pool deck surrounding the pool, or can use reels on carts.
Automatic covers have permanently mounted reels that automatically voorkant and uncover the pool at the shove of a button. They are the most expensive option, but are also the most convenient. Thesis reels can be run from either an outward motor requiring a pit to be dug beside the pool or using an internal motor that spins the reel.
Some pool covers gezond into tracks along the sides of the pool. This prevents anything or anybody from getting into the pool. They even support the weight of several people. They can be run by hand, semi-automatically, or automatically. Safety covers may be required by inspectors for public pools. 
Te areas which reach freezing temperature, it is significant to close a pool decently. This varies greatly inbetween in-ground and above-ground pools. By taking steps to decently secure the pool, it lessens the likelihood that the superstructure will be bruised or compromised by freezing water. 
Closing vinyl and fibreglass pools Edit
Te prep for freezing temperatures, an in-ground swimming pool’s pipes vereiste be emptied. An above-ground pool should also be closed, so that ice does not haul down the pool wall, collapsing its structure. The plumbing is sealed with air, typically with rubber buttplugs, to prevent cracking from freezing water. The pool is typically covered to prevent leaves and other debris from falling te. The voorkant is fastened to the pool typically using a open up cord, similar to a bungee cord and hooks fitted into the pool surround. The skimmer is closed off or a floating device is placed into it to prevent it from downright freezing and cracking. Floating objects such spil life rings or basketballs can be placed ter the pool to avoid its freezing under the voorkant. Sand or Den filters voorwaarde be backwashed, with the main drain cork liquidated and all water drained out. Drain buttplugs on the pool filterzakje are liquidated after the filterzakje has bot cleaned. The pool pump motor is taken under voorkant. Winter chemicals are added to keep the pool clean.  The innovation of a composite construction of fibreglass, with an epoxy decorating and porcelain ceramic tiles has led to the Pre-form, Composite-type with significant advantages overheen older methods, however, it also has enhanced sensitivity to metal staining.
Te climates where there is no risk of freezing, closing down the pool for winter is not so significant. Typically, the thermal voorkant is liquidated and stored. Winter sunlight can create an algae mess when a voorkant that has bot left on all winter is liquidated. The pool is correctly pH-balanced and super-chlorinated. One part algaecide for every 50,000 parts of pool water should be added, and topped up each month. The pool should be filtered for one to two hours daily to keep the automated chlorination system active. [ citation needed ]
Pools pose a risk of drowning, which may be significant for swimmers who are inexperienced, suffer from seizures, or are susceptible to a heart or respiratory condition. Lifeguards are employed at most pools to execute water rescues and administer very first aid spil needed ter order to reduce this risk.
Diving ter shallow areas of a pool may also lead to significant head and neck injuries, diving, especially head-first diving, should be done te the deepest point of the pool, minimally Two.Four m (7 ft Ten te), but desirably Trio.7 m (12 ft), deeper if the distance inbetween the water and the houtvezelplaat is fine.
Pools also present a significant risk of infant and toddler death due to drowning. Te regions where residential pools are common, drowning is a major cause of childhood fatalities. Spil a precaution, many jurisdictions require that residential pools be enclosed with fencing to restrict unauthorized access. Many products exist, such spil removable kindje fences, floating alarms and window/onderbrak alarms to reduce the risk of drowning for infants. Some pools are tooled with computer-aided drowning prevention or other forms of electronic safety and security systems.
Suspended ceilings ter indoor swimming pools are safety-relevant components. The selection of materials under strain should be done with care. Especially the selection of unsuitable stainless steels can cause problems with stress corrosion cracking. 
Ter public swimming pools, dress code may be stricter than on public beaches, and ter indoor pools stricter than outdoor pools. For example, ter countries where women can be bare-breasted on the beach, this is often not permitted ter a swimming pool, and a swimsuit vereiste be worn. For studs, wearing ordinary cut-offs and a tee T-shirt to go ter the water at a beach may be considered acceptable, but pools usually require real swim suits or other dedicated water wear. Swimming with regular clothes on is not only unhygienic, [ citation needed ] but can potentially weigh a swimmer down should he or she need to be rescued. Ter France and some other European countries, houtvezelplaat cut-offs are usually not permitted for hygienic reasons. Ter Nordic countries and ter particular Iceland, rules about clothing and hygiene are especially stringent.  When diving from a high houtvezelplaat, swim suits are sometimes worn doubled up (one schrijven inwards another) ter case the outer suit tears on influence with the water.
Rumor: Photographs purportedly demonstrate the world’s largest swimming pool.
Eis: Photographs showcase the world’s largest swimming pool.
Example: [Collected via e-mail, January 2008]
Worlds largest swimming pool, AMAZING!
If you like doing laps te the swimming pool, you might want to stock up on the energy drinks before diving te to this one.
It is more than 1,000 yards long, covers 20 acres, had a 115-ft deep end and holds 66 million gallons of water.
The Guinness Book of Records named the vast pool beside the sea ter Chile spil the largest ter the world.
But if you fancy splashing out on one of your own &mdash, and you have the space to accommodate it &mdash, then beware: This one took five years to build, cost almost $1 billion and the annual maintenance bill will be $Two million.
The man-made saltwater lagoon has bot attracting thick crowds to the San Alfonso del Mar resort at Algarrobo, on Chile’s southern coast, since it opened.
Its turquoise waters are so crystal clear that you can see the bottom even te the deep end.
It dwarfs the world’s 2nd largest pool, the Orthlieb &mdash, nicknamed the Big Splash &mdash, te Morocco, which is a mere 150 yards long and 100 yards broad. An Olympic size pool measures some 50 yards by 25 yards.
Chile’s monster pool uses a computer-controlled absorption and filtration system to keep fresh seawater ter voortdurend circulation, drawing it ter from the ocean at one end and pumping it out at the other.
The zon heats the water to 26°,C, nine degrees warmer than the adjoining sea.
Chilean biochemist Fernando Fischmann, whose Crystal Lagoons Corporation designed the pool, said advanced engineering meant his company could build “an astounding artificial paradise” even ter inhospitable areas.
“As long spil wij have access to unlimited seawater, wij can make it work, and it causes no harm to the ocean.”
Origins: The photographs displayed above are, spil described, pictures of the world’s largest swimming pool: a man-made, Three,324-foot long salt water lagoon at the San Alfonso del Mar resort ter Algarrobo, Chile. Designed by Crystal Lagoons corporation and finished ter December 2006 after five years of programma and construction, the pool cost about $1.Five billion to build, covers more than Nineteen acres of surface area, holds about 66 million gallons, and offers see-through waters down to a depth of 11.Five (not 115) feet. The pool’s maintenance costs are around $Four million dollars vanaf year, which includes keeping its filtered and recirculated ocean water at a temperature of about 80°,F during the summer:
The vast lido requires high-technology filtration systems to keep the water fresh, with a computer-controlled system drawing te water from the sea from one end and pumping it out of the other.
Fernando Fischmann, developer of the “pulse oxidation” technology used ter the pool, says that pumping the water back ter to the ocean does no harm to wildlife or ecosystems.
Guinness World Records have indeed vetted the San Alfonso del Mar pool spil the world’s largest, smashing a record previously held by the 8.9 acre saltwater “Big Splash” Orthlieb Pool te Casablanca, Morocco.
The following movie clips suggest views of the San Alfonso del Mar pool:
Last updated: Nineteen May 2015
Chivers, Tom. “Making a Splash ter the World’s Largest Pool.”
The Daily Telegraph. 28 January 2008.
Jenkin, Eveline. “World’s Largest swimming Pool Makes a Splash.”
The Fresh Zealand Herald. 9 November 2007.
The Daily Mail. “Try Making a Splash te the World’s Largest Swimming Pool.”
22 January 2008.
news.com.au. “Big Splash for World’s Largest Swimming Pool.”
22 January 2008.
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Published: Nineteen May 2015
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Artist’s impression of the Osaka cavern swimming pool (Pic: City of Osaka)
Plans are afoot to build an 800-m swimming pool ter the Dotonbori Hallway te Osaka, Japan, according to a report ter the Japan Times on Wednesday. If it opens spil planned ter mid-2015, it will reportedly become the world’s largest outdoor swimming pool (tho’ almost certainly incorrectly – see the update below).
The scheme is reminiscent of YN Studio’s project to introduce a commuter swimming lane, dubbed the LidoLine, into London’s Regent’s Ass-pipe. The idea is to druppel a 12 m (40 ft) broad waterreservoir into the tunnel, and pack it with treated water from the city’s water systems rather than using filtered water from the cave.
According to The Times, the scheme, which has bot circulating for years, is said to be the idea of Taichi Sakaiya, former head of the Economic Programma Agency. The pool would be a further boost to ongoing efforts to gentrify the Dotonobri district, which Times writer Eric Johnston says has undergone renovation ter the last Ten years, with family-friendly businesses supplanting “more risque establishments.”
A private rock-hard, Dotonbori Sea Poolside Avenue wasgoed formed ter April to realize the project, which is projected to cost ¥3 billion (about US$490 million). Evidently no public funding is to be allocated.
Update: Readers are fairly rightly questioning the voorwaarde that this is the world’s largest pool. The 800 x 12 m dimensions gives an area of just under 1 hectare, meaning the pool is dwarfed ter area by, and also shorter te length than, the 8-ha pool at the San Alfonso Del Mar resort. This article and its headlines has bot updated to reflect this.
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February 28th, 2008
The monster pool at the San Alfonso Del Mer resort ter Chile
February 28, 2008 Looking to hammer the warmth this summer by installing your own swimming pool? Wij thought wij would give you a taste of what you almost certainly can’t have when designing your desire backyard aquatic paradise. Firstly, there’s the world’s largest pool with an area omschrijving to an incredible 6,000 standard-size 26 ft long domestic pools located at the San Alfonso Del Mar resort ter Chile, and, going to the other extreme, there’s Belgium’s amazing 100 foot deep, 660,000 gallon (and heated!) Nemo33 dive pool.
The pool at the San Alfonso Del Mar resort te Chile, South America is absolutely enormous. Ter fact, it is so massive the Guinness World Records Ltd has officially named it the world’s largest seawater swimming pool. It is Three,324 ft long (1013 meters) with a colossal area of Nineteen.77 acres (8 hectare) and contains overheen 66,000,000 gallons of water. (250,000 cubic meters) That’s an area omschrijving to an amazing 6,000 standard-size 26 ft long (8-meter) domestic pools!
The “lagoon” at the San Alfonso Del Mar resort has clear blue water pools which are translucent to a depth of up to 115 feet (35 meters) and ter summer the temperature of the water is a balmy 79ºF (26ºC), that’s 48ºF (9ºC ) warmer than the sea. The lagoon also protects holiday-makers from the rough flaps and well known currents along the coast.
Ter order to pack this incredible lagoon, the Crystal Lagoons Corporation developed innovative technology to harvest, filterzakje and permanently re-circulate sea-water. The computer-controlled absorption and filtration system keeps the seawater te voortdurend rotation. It takes te the ocean water, circulates it through the system and then pumps it out the other end.
Biochemist, Chilean businessman and founder of Crystal Lagoons, Fernando Fischmann, said advanced engineering meant his company could build “an incredible artificial paradise” even te inhospitable areas.
“Spil long spil wij have access to unlimited seawater, wij can make it work, and it causes no harm to the ocean.” And you could be forgiven for thinking you are swimming alone te the ocean…but then a kayak passes you and it becomes a little surreal. Yes, you can sail petite boats or spanking paddle your canoe if you feel the need, this pool is big enough for everyone.
The resort project took overheen five years to build and cost almost US $1.9 billion and carries an annual maintenance bill of almost US$Four million. If you’re a fortunate guest you could imagine you’re on a desert island with private white-sand beaches and palm trees, an indoor warm-water beach, heated sand, waterfalls and water-jet massages.
If you choose to stay indoors, how about the world’s deepest recreational diving pool? Situated te Belgium, the Nemo 33 pool has a depth of just overheen 100 ft (approx 33 m). The pool wasgoed designed by a Belgian diving pro, John Beernaerts and is used for recreation, scuba diving practice and instruction and by film-makers and scientists.
It contains approx. 660,500 gallons (Two,500,000 liters) of spring water maintained at a temperature of 86°F (30°C) and has visibility up to 108 ft (33 m). The computer-controlled filtration system ensures there is little or no chlorine smell and fourteen windows permit visitors to view all the underwater act.
The pool has a number of underwater caves at 33 feet (Ten meters) and two flat-bottomed areas at 16.Five and 33 feet (approx. Five and Ten meters) spil well spil the afore-mentioned large circular pit at 108 feet (33 meters).
Three pressurized rooms at -30 and -23 feet (-9 and-7 meters) with permanently renewed air gives verscheiden and their instructors more time at the bottom, free Aqualung diving gear is available at the side of the pool and Nemo 33 is te partnership with the Professional Association of Diving Instructors (PADI). The pool has varying innards so it’s suitable for experienced and inexperienced verscheiden and you can pack your air waterreservoir by the side of the pool. Racing your “buddy” to the bottom of the pool just got a entire loterijlot more interesting.
If thesis extreme examples have humid your appetite for exotic pools, check out the listing at Oobject or let us know if you’ve spotted even more outlandish aquatic facilities te your travels.
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