.
The toilet on the first floor doesn't flush that well. I don't know if the
reason is because of venting, or if the reason is because its a 'builders'
fixture (Mansfield is the brand).


Here's some tips..........

http://www.factsfacts.com/MyHomeRepair/SlowFlush.htm

***Clogged holes underneath the rim of the bowl. Use a curved piece of
wire to poke gently into each flush hole to clear out any debris. Coat-
hanger wire works fine.You can also use wire to loosen debris that may
be blocking the siphon jet in the bottom of the drain.***

Dean