I have a 10-year-old toilet (not a modern water-saver) that will not flush all the way. The flapper falls back down and stops the flush when there are still 5-6 inches of water in the tank. If I hold the handle down (and flapper up) until all the water has run out of the tank, it flushes OK (the water level in the tank is OK). I have replaced the flapper 3 times, even with the adjustable flush kind, but the flapper still falls down too soon and shuts off the flush before it is finished.
I have gone online to several pages – Toiletology, Fluidmaster, etc. – but I can’t find the solution to this problem.
Any ideas? Thanks!