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2. Trench drain - Wikipedia

   en.wikipedia.org/wiki/Trench_drain

   A channel drain in a Vancouver condo. The popular trend in trench drains are linear systems. Linear as in line drain. Made from materials such as polymer concrete, fiberglass, structural plastic and steel, liner systems are the channel and grate components that are assembled in the trench and around which concrete is poured to form a drain ...

3. 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.

4. 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.

5. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   When any of these pool chemicals are used, it is very important to keep the pH of the pool in the range 7.2 to 7.8 – according to the Langelier Saturation Index, or 7.8 to 8.2 – according to the Hamilton Index; higher pH drastically reduces the sanitizing power of the chlorine due to reduced oxidation-reduction potential (ORP), while lower ...

6. 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.

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