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2. Pool skimmer - Wikipedia

   en.wikipedia.org/wiki/Pool_skimmer

   If the pool is designed and operated correctly, this circulation is visible and, after a period, reaches even the deepest end, inducing a low-speed vortex over the main drain due to suction. Correct use of return jets is the most effective way to remove disinfection byproducts caused by deeper decaying organic debris and bring them into the ...

3. Pool suction-drain injury - Wikipedia

   en.wikipedia.org/wiki/Pool_suction-drain_injury

   In 1982, the Consumer Product Safety Commission reported that five children were disemboweled by drains in wading pools and urged pools to install covers on drains. [2] [3] A standard 8 inches (20 cm) main drain can develop up to 350 pounds (160 kg) of force, which could hold a person underwater in tight grip until the suction is released.

4. Drain (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Drain_(plumbing)

   Pool drain vortex as viewed from above the water at Grange Park wading pool Underwater view of drain, showing vortex-formation phenomenon. A drain is the primary vessel or conduit for unwanted water or waste liquids to flow away, either to a more useful area, funnelled into a receptacle, or run into sewers or stormwater mains as waste discharge to be released or processed.

5. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Therefore, it is advised to either completely drain the pool, and refill it with fresh water, or recycle the existing pool water, using reverse osmosis. The advantage of the latter method is that 90% of the water can be reused. Pool operators must also store and handle cleaning and sanitation chemicals safely.

6. Virginia Graeme Baker Pool and Spa Safety Act - Wikipedia

   en.wikipedia.org/wiki/Virginia_Graeme_Baker_Pool...

   Sec. 1404: Top Priority for Public Pool And Spa Owners/Operators All pool/spa drain covers manufactured, distributed or entered into commerce on or after December 19, 2008, must meet ASME/ANSI A112.19.8– 2007. All public pools and spas must be retrofitted with covers that meet the ASME/ANSI A112.19.8– 2007 standard.

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