I have a raised bungalow and the toilet in the basement tends to run
constantly. (Sounds like its trying to self flush almost.) I replaced the
tower in the tank thinking that the bottom seal was worn out, but it
continued. Therefore I replaced the toilet with a Cadet 3 toilet from HD. It
worked fine for maybe 6 months and has started to run constantly again. There
is nothing blocking the seal and we don't use those tank
deodorant/self-cleaning pucks. Any thoughts?

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