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I don't use the in-tank chlorine tablets, and the water is potable, from the city water main. It is supposed to be safe to drink, so I don't think it has anything to do with chlorine, it has to do...

I purchased both of my Totos in August of 2007, and the first flapper I replaced was in July of 2008 (in 1/2 bath that gets most use.) Second ones' original lasted till Thanksgiving, both...

Thanks for adding the picture Terry!
All of the green is rigid plastic, so is the white adjustable "bubble" float. The gray is the silicone sealing ring.
I had looked at the Fluidmaster product...

I hope that I have found the solution. I bought a Fluidmaster 5403 3 inch universal toilet flapper that comes with a 10 year warranty.
It is primarily made of a hard, rigid plastic, with a silicone...

I've had the same problem with both of my Toto's. The lift rod was not aligned over the flapper out of the box, but is easily bent back (careful not to break it!)

The flapper deforms and leaks....