Toilet bowl only 1/3 full
Toilet bowls have a trap (just like a sink) built into them. There is no adjusting the water level. Excess water goes over the top of the trap and down the drain pipe. If the bowl is now holding less water than it was in the past, there is probably a leak in the trap area. The only way to check this is by removing the toilet and filling the bowl while the toilet is set up on some blocking to see where the water is going after filling the bowl with a hose or bucket. As long as the tank is filled to within 3/4" of the top of the overflow tube, and the flapper stays up long enough to allow most of the water to exit the tank, the toilet is delivering a "full flush".
I wanted to add that Plumcass is right on, with the tube. This adds water to the bowl when the toilet is flushed.
If you have never made a mistake, you haven't done much.
Last edited by majakdragon; 11-04-2008 at 09:51 AM.
Reason: Additional info