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Because the passageways in the toilet that carry the water from the tank to the bowl are, umm, 'full of air' (for lack of a better term). The water rushes from the tank into the bowl to flush, but all the air is in the way, so you see some come out of the siphon. That's as simple as I can make it.

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16y ago

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Which one is the best flush available in Indian market for the air block problems?

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