rich is correct. i had the same type of problem (sometimes ok, sometimes
not). the water passages would build up and I wouldn't get good waterflow.

check the small hole where the water comes in at the bottom of the bowl.
"Rich" wrote in message
news:dcoDf.16867$K17.4498@trnddc03...
Calcium buildup in passages particularly the larger one at the bottom near
the drain hole. Use a bunch of pipe cleaners and some C.L.R. or any other
commercial calcium remover. Clear the hole and I'll betcha it'll flush
like new.

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"badgolferman" wrote in message
...
One of our toilets doesn't drain very well. If you take a crap and
wipe yourself a couple of times it sometimes backs up. I can plunge it
and clear it, but who wants to do that 2-3 times a month? I am on a
concrete slab.