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2. Drain-waste-vent system - Wikipedia

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

   Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.

3. How To Clean A Toilet Tank To Prevent Rust And Mildew ... - AOL

   www.aol.com/lifestyle/clean-toilet-tank-prevent...

   Good news: it's easy! Home & Garden. Medicare

4. Trap (plumbing) - Wikipedia

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

   In the United States, plumbing codes usually provide strict limitations on how far a trap may be located from the nearest vent stack. When a vent cannot be provided, an air admittance valve may be used instead. These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).

5. In-tank toilet cleaning tablet - Wikipedia

   en.wikipedia.org/wiki/In-tank_toilet_cleaning_tablet

   In-tank toilet cleaners (also known as toilet water tablets or drop-in toilet bowl cleaners) are tablets or cartridges that add chemicals to toilet tank water to reduce toilet bowl stains. They are commonly used to prevent toilet bowl stains from calcium, limescale, mold, etc. [1] Most contain chlorine bleach as its main active ingredient, [2 ...

6. How to Clean Your Toilet the Right Way - AOL

   www.aol.com/lifestyle/clean-toilet-way-144800626...

   Consider these expert toilet cleaning tips, hacks and cleaning products to prevent germs from building up and keep your bathroom looking its best. Skip to main content. Sign in. Mail. 24/7 Help ...

7. Toilet cleaner - Wikipedia

   en.wikipedia.org/wiki/Toilet_cleaner

   Toilet cleaner is sprayed around the rim and into the bowl of the toilet prior to the use of the toilet brush. The toilet brush is used to scrub the toilet, removing stubborn stains and biological debris. In recent times, automatic toilet bowl cleaners that clip onto the rim of the toilet and clean with every flush have also become prevalent.