You need a new flapper.
We've had two Toto Aquias for a couple years now and they've been good fixtures for us. However, one of them has had a small rivulet/dribble of water leaking from the bowl into the tank for far too long and I've finally decided to address the issue. When I turn the water supply to the toilet off, the tank drains into the bowl completely in about 1 hour ... thereby negating any water savings this toilet is supposed to deliver.
I somehow, somewhere read that it could be an issue with toilet fill valve cap, which I replaced, but the issue remains. Really, though, after thinking about this further, I don't see how this could be the cause of the leak into the bowl from the tank.
I suspect it could be the flush valve that needs to be replaced, but want some advice first. Are there other things I should check first?
By the way, this toilet has never been all that stable on the uneven tile floor on which it is installed. The plumber who installed these used some shims, but those seem to have become dislodged, so I just placed new shims at the base. I doubt that could be the cause for any of the leakage from the tank to the bowl, but wanted to raise all possibilities.
Thanks, in advance, for any help anyone can provide!
If this was a traditional toilet, I would think I need a new flapper, too. But the Aquia doesn't have a "flapper" per se. The flush valve seems to do the same thing as a flapper (see photo below), so I speculated that I needed a new one, but wanted to see if there were any other ideas/suggestions first. I know, for example, that some have said that they needed to sand the inside of the tank in order for the tank bolt seals to completely seal. Could the rough tank surface be causing any of my dribbling issues?
If you pull the tube from the flush valve and rotate it out, you will see the seal at the bottom.
That part is replaceable.
When a tank drains, it isn't sealed. That could be the flapper, or in this case a disc type seal on the end of the flush valve, or the seal that is between the tank and the plastic fitting. Either way, until it's holding water, it's a water waster.
All toilets should by inspected and repaired as needed. Not too many repair themselves.
Wait................no, I can't think of any that repair themselves.
Instead of buying new seals, I just flipped the one at the bottom of the flush valve over ... and everything works perfectly. It may be a temporary fix, but a fix nonetheless.