It depends on the design. Some of these have a flapper with a hole in the cylinder on the bottom side. Watch the flapper as you flush normally. You will see a few bubbles come out of the hole and the flapper will drop before the tank is empty.
If this is the case, you can plug the little hole with something, or buy a new flapper without the hole.
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It depends on the design. Some of these have a flapper with a hole in the cylinder on the bottom side. Watch the flapper as you flush normally. You will see a few bubbles come out of the hole and the flapper will drop before the tank is empty.
If this is the case, you can plug the little hole with something, or buy a new flapper without the hole.