Summary
To troubleshoot a weak toilet flush, check and adjust the tank's components (refill tube, water level, chain slack) and clear any blockages in the bowl's jet and rim holes. If the problem persists, consider replacing the wax ring or checking the vent pipe, potentially with a plumber's assistance.
Answer:
Before you begin troubleshooting, it is essential that the bowl is clean and that your supply valve is opened fully.
Please keep in mind, the National Energy Policy Act of 1992 stated effective January 1, 1994 that all water closets shall be 1.6 gallons per flush maximum.
Inside your toilet tank you'll want to check the following:
- Make sure the refill tube is connected to the water control and inserted into the overflow tube without being kinked or damaged.
- Adjust the water level. It should be no lower than 1/2" below the top of the overflow tube. If it is lower than 1/2", raise the water level by turning the top screw on the water control counterclockwise. (You may need to flush after adjusting the screw to get the water level to rise.)
- Make sure the chain has only 1/4 inch of slack. (When you hit the trip lever, the arm should only move 1/4 inch before activation.)
Inside the toilet bowl you'll need to check the following:
- Inspect the jet hole for blockages to ensure maximum flow from the jet hole with each flush.
- Important: Do not stick your finger in the jet hole.
- Use a mirror and a coat hanger or a 6/8 penny nail to clean out the holes under the rim (inside the bowl). Mineral deposits from water may cause the rim holes and jet hole to "shrink," which limits the flow of water.
- Verify the water level in the bowl is adequate. A typical water spot in a bowl is approximately 8-9" of surface water from side to side.
Lastly, if the toilet still isn't flushing well:
- Reset the toilet with a new wax ring. You may need to consult a plumber to do so.
- Inspect the vent hole on the roof of your home. It may be necessary to clear debris that made its way into a vent pipe, which can cause clogging. For this, we would recommend calling a plumber.