The problem with displacing the water in your toilet tank is that alot of toilets end up not having the power to flush at that point, so you flush a 2nd time, using more water then if you had left your toilet alone, this is a toilet design flaw because there are toilets out there that flush with less water and work great! mine is a duel flush 1/1.6 gallon toilet and the 1 gallon flush works 95% of the time because the rest of the toilet is designed for the smaller amount of water.
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