If you have an older, conventional toilet, you are probably using more water than you need to, to clearThe bowl. You ought to consider installing a new, low flush toilet, but until you doThis, Toilet Tank Bank displacement bag will reduceThe amount of water in your existing tank by about 0.8 gallons, saving that amount of water with each flush. Over timeThis can add up. FillThe displacement bag with water, closeThe valve to prevent eventual evaporation,and hangThe bag insideThe tank ofThe toilet withThe bag’s hook. Saving water has never been easier.