It's easy and cheap to replace the flap. That may solve it.
Sometimes I just shorten the chain a little so that when I press the flush
handle the flap gets lifted all the way up. Then it takes longer before it
drops and closes the opening.
Mark Savoy wrote:
I have found that, if the chain doesn't lift the flapper high enough to
begin with, it doesn't seem to "float" the way it is supposed to and it
drops prematurely. There seems to be some "threshold" point that it must be
lifted past before it will work properly. So, sometimes, if the chain is
too long, depressing the lever to lift the flapper only lifts it a certain
amount before the lever itself hits the top of the toilet tank. Then, the
flapper doesn't seem to work right, and the flush is not complete. In those
cases, I shorten the chain a little , the flap lifts completely before the
lever bar hits the top of the tank, and the toilet flushes completely before
the flapper drops and closes. I sometimes test this theory by taking the
lid off and only letting the flush lever lift the flapper part way, and then
the flush is incomplete. Lift it all the way, and everything works
correctly. In those situations, I shorten the chain a little to make it
Steve Barker wrote:
I've never ssen a toilet that emptied completely. It just isn't a requirement of
the design. Newer toilets often empty only part way by design, unless you hold
the handle down for a bigger flush. I think they use an additional float, and a
heavier flapper to get that operation.
The flapper has to open high enough to fill the cavity inside the
flapper with air, that holds it up longer.
I believe it starts with the air already there. Holding it up higher will just
fill it with water. (Which, I suppose, could cause the OP's problem)
Answer is "yes".
Look for a hole in the air-holding bulb at the base of the flapper.
Some have it so that it can be turned as much as 90 degrees
for maximum flush duration.
Other people that want to save themselves from having the toilet
send most of its water out just to flush some urine away can drill
a hole at the high side, and simply hold the flush handle down
longer for a more complete flush when the load is brown.
It is not suppose to empty the tank. It is designed to
provide enough water to flush properly under normal conditions. For
heavy duty flush when needed, hold the handle down. It is designed
that way to save water when it is not needed.
I checked the chain and there is no extra slack. I watched the problem
toilet and another toilet that is working fine. The problem toilet's
flap doesn't float at all, it seals off immediately. I looks as though
the flap is the culprit. Thanks for all the advise.
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