How to Clear a Clogged Plumbing Vent)."/> How to Clear a Clogged Plumbing Vent)."/>How to Fix Flushing Problems | HomeSteady

How to Fix Flushing Problems

Water-saving toilets tend to experience flushing problems. The following simple service should improve performance. If it doesn't work, the vent pipe may be obstructed (see How to Clear a Clogged Plumbing Vent).

Step 1

Fully open the water supply's shutoff valve to assure that there is adequate water pressure and volume. 

Step 2

Clear any obstruction in the toilet trapway.  Push a closet auger into the bowl opening until you feel an obstruction.

Turn clockwise to screw the auger into the obstruction and draw it out. 

Step 3

Use a mirror to inspect the holes on the rim's underside during a flush.  Clear any clogged holes with a piece of copper wire.

Step 4

Adjust the water level until it's at the water line marked on the tank or overflow tube.  Flush to test.

To adjust water levels on plunger- or diaphragm-type fill valves with a float ball, either turn the adjustment screws on those models that have them or use both hands to bend the arm--down to lower the water level, up to raise it.  For floatless models, turn the adjustment screw about a half turn at a time.

For float-cup fill valves, pinch the spring clip to raise or lower the float. 

Things You Will Need

  • Closet Auger
  • Small Mirror And Copper Wire
  • Screwdriver


  • Wear rubber gloves to protect your hands.
  • At the proper height, the water level should be no more than 1/2 inch (12 mm) below the top of the overflow tube. If the tube's too long, cut it with a hacksaw. Some tubes unscrew. If yours doesn't, remove the flush valve to make the cut.

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