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  2. Here's How Often You Should Drain Your Water Heater ... - AOL

    www.aol.com/lifestyle/heres-often-drain-water...

    Draining your water heater is a key home maintenance task you won’t want to ignore.

  3. Heat trap - Wikipedia

    en.wikipedia.org/wiki/Heat_trap

    Heat traps are valves or loops of pipe on the cold water inlet and hot water outlet of water heaters. The heat traps allow cold water to flow into the water heater tank, but prevent unwanted natural convection and heated water to flow out of the tank. [1] [2] Newer water heaters have built-in heat traps.

  4. Water fluoridation - Wikipedia

    en.wikipedia.org/wiki/Water_fluoridation

    Water fluoridation is the controlled addition of fluoride to public water supplies to reduce tooth decay. Fluoridated water maintains fluoride levels effective for cavity prevention, achieved naturally or through supplementation. [2] In the mouth, fluoride slows tooth enamel demineralization and enhances remineralization in early-stage cavities ...

  5. 11 things you should never put down the drain - AOL

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  6. There's a lot of misinformation about fluoride. Here's what ...

    www.aol.com/lifestyle/fluoride-helpful-harmful...

    Fluoride in community drinking water systems is regulated at the state and local level, Henderson says. If you drink water that's not from a well, you're getting at least some level of fluoride in ...

  7. Thermostatic mixing valve - Wikipedia

    en.wikipedia.org/wiki/Thermostatic_mixing_valve

    There are three main categories for water temperature controlling devices: Heat Source, Group Control, and Point-of-Use. Heat Source. These are used with central heating systems that use water as a medium. Tempering valves for use on hot water heat distribution systems; High flow rates suitable for use in under floor (radiant) heating applications

  8. The two things you should never throw down the drain - AOL

    www.aol.com/lifestyle/2019-09-15-the-two-things...

    There are two items in particular that plumbers signify as the biggest culprit for drain blockages, especially during the holidays. The two things you should never throw down the drain Skip to ...

  9. Fluoride toxicity - Wikipedia

    en.wikipedia.org/wiki/Fluoride_toxicity

    Referring to a common salt of fluoride, sodium fluoride (NaF), the lethal dose for most adult humans is estimated at 5 to 10 g (which is equivalent to 32 to 64 mg elemental fluoride/kg body weight). [ 2 ] [ 3 ] [ 4 ] Ingestion of fluoride can produce gastrointestinal discomfort at doses at least 15 to 20 times lower (0.2–0.3 mg/kg or 10 to 15 ...