[akaivyleaf]

I don't use any of those dissolving tablets, I think it is whatever else BESIDES the bleach or in combination with the Bleach that causes the flap to warp. I, like you have to replace too many of them, before someone else told me the problem.

I do use bleach in the toilet bowl as it is my favorite cleaner. I use it everywhere. And I'm guilty of mixing it with ammonia on occasion, but well ventilated.