I actually removed the toilet from it's mount and the pipe appears OK.
I also did a test where I took a plunger and blocked the exit to the bowl and allowed the bowl to fill to the rim and then pulled away the plunger and the water ran out of there like a freight train.
It's very strange, when i flush it normally, with nothing in the bowl, the water drains, then comes back a bit, then drains.
It's driving me nuts.
The old toilet in the basement is an old american standard and it could swallow a brick. This one, a kohler, is an expensive P.O.S.
I didn't buy the hard water line either, it's city water from lake ontario. Mind you, after a winter, my furnace de-humidifier (! must shut off that thing) usually has a 1/4" of lime in the bottom of the pan.
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