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What happens if a toilet is not used? - Quora
If you poured water into a toilet until it was mostly full, but
Can a toilet cause sewer gas to enter another room? - Quora
What determines how much standing water there is in a toilet bowl
What would cause water in a toilet bowl to be only about as deep
What determines how much standing water there is in a toilet bowl
Why do some people squat on the toilet seat rather than sit on it
Why do toilets are always filled with water and how? - Quora
Do most urinals have some visible water in them before you flush