Mysterious Toilet Problem
I have an upstairs and a downstairs toilet which are "slow flushes" (they are on the same pipe system). The upstairs one is an old one from 1966. Sometimes they don't flush everything. Two plumbers have looked at it. The first one said mineral deposits were "dragging" it and had me give the toilet the vinegar treatment. Didn't work. The next plumber (who is very highly qualified and respected) and his partner worked on both toilets and fixed the seals. Which seals, I couldn't tell you. Things are better, but the toilets still flush reluctantly and leave stuff behind. Any ideas on what could be wrong?
Also, should I call the second plumber back? He told me to, if there was still a problem. But if he couldn't fix it the first time, could he figure it out the second?!