On Tue, 1 Jun 2021 13:36:21 -0700 (PDT), Marilyn Manson
wrote:

On Tuesday, June 1, 2021 at 8:54:51 AM UTC-4, TimR wrote:
About every two years my toilets start leaking into the bowl enough that they periodically refill. I guess my water is aggressive enough to eat away at them.

Last time I paid my plumber to do it instead of me, thinking he would have better quality parts. Nope, he went to Home Depot and bought the same stuff I did.

Is there anything better out there that will last a bit longer? Or is this just routine maintenance like filter changes.

Have you considered that the problem isn't the flapper(s)?

Maybe the flush valve seat - the part where the flapper lands - is rough/out of round/etc. Maybe a brand new
flexible flapper seals properly but after a short time it can't compensate for a faulty seat.

That's just a guess, but you shouldn't have to replace the flapper every 2 years.

Do you have more than one toilet? If so, it is only this toilet that gives you trouble? If so, I'd
have to say that it's something other than the flapper(s).

My answer too. Had an oldie that has a brass valve seat - or maybe it
was chrome and later brass - with a rubber ball that dropped down on
the valve. It had corroded enough to create a tiny leak. Being a
responsible renter I bought a replacement fix that was a flapper &
seat with a gummy adhesive that went over the old seal.