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  2. Grease trap - Wikipedia

    en.wikipedia.org/wiki/Grease_trap

    Large in-ground tanks, usually 500–2,000 US gallons (2,000–8,000 L), are also passive grease interceptors. These units, made of concrete, fiberglass, or steel, have greater grease and solid storage capacities for high-flow applications such as a restaurant or hospital store. They are commonly called gravity interceptors.

  3. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    The sieve baskets are easily removed daily for cleaning as is the sand unit, which should be back-washed at least once a week. A perfectly maintained consecutive dilution system drastically reduces the build-up of chloramines and other DBP's. The water returned to the pool should have been cleared of all organic waste above 10 microns in size.

  4. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

  5. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    All well washers are installed with RPZ Devices in case a pumping station breaks down, and the sewerage level rises above the well washer, causing backflow down the water supply line. A reduced pressure zone device is tested with a device called a differential gauge.

  6. Pool suction-drain injury - Wikipedia

    en.wikipedia.org/wiki/Pool_suction-drain_injury

    Pool suction-drain injury, also known as suction entrapment, occurs when the drain of a wading pool, swimming pool, hot tub, or fountain sucks in a swimmer's jewelry, torso, limbs, hair or buttocks. In some cases of buttocks entrapment, victims are disemboweled .

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