I have the same issue in my house and fought it for 15yrs. Upstairs toilet that i think doesnt flush enough watr per flush. If nobody poops upstairs 0 issue. If they do it clogs 1
or 2 time a year. Not sure if its the gradual 90 at the bottom or what..dont buy a low toilet.
or 2 time a year. Not sure if its the gradual 90 at the bottom or what..dont buy a low toilet.