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Toilet Bowl Water Level Slowly Drops

I recently replaced my toilet's fill valve and flapper to resolve some running water/leaking issues - which were fixed.

But now my problem is that as soon as the bowl is finished filling (which seems to be at a normal level initially) - the water level immediately drops about 1-1.5 inches.

Then after letting the toilet sit overnight, the water level drops even more, down to where there is just enough water cover the trap. So the loss of water level seems to be fairly slow after the initial 1-2 inch drop.

Here's the things I've tried from other research without much success:

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I don't see any external leaks around the toilet.

I’ve checked that the flapper chain has enough play for the flapper.

I've checked that the fill valve hose is positioned correctly.

I've raised the fill valve floater to as high is it can be while maintaining the water line to where it should be.

I've tried ''slowing'' down the water fill by turning down water pressure. Some say a tank that fills to fast won't allow the bowl to fill to normal capacity.

I've checked the little holes along the toilet rim and they seem to not be clogged/blocked.

I've forced the trap to clear by turning off the water while pouring multiple gallons of water down the toilet which flushes with good amount of force so there doesn't seem to be any clogs there - but not certain.

I have not checked the vent on the roof to see if it blocked which would might cause siphoning in the toilets?
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I used the Fluidmaster 400A fill valve kit and flapper and the toilet is a Kohler 1.6 gpf model.

I'm running out of ideas, any suggestions on what else to check or what could be the cause?

Thanks

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  • 117 Answers

Check the fill tube in your toilet one easy way to see if it's leaking is get food coloring and pour in your tank to color the water this makes it easier to see and squeeze the tube in the tank when it's full if you see the colored water running down the middle of it you have a winner! if not you can look around for it sometimes the plastic under the flapper gets cracked too

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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