We have very hard water in this area and my water softener circuit does not include the toilet (yup, fixing this is the long term solution) which has over the years required more and more hold-the-handle-down time to properly flush. I installed a "slow" flapper valve a few weeks back, which stayed open long enough on its own for a while but not any more. Is there any reasonable way to get rid of the lime build-up within the passages?
TIA