How to repair a low-flow toilet


 The inability to flush waste into the toilet is a common problem due to a low-flow toilet. You will notice that the flush is slow and does not go down. Then you have to wait for the tank to fill up and flush again. This can be disgusting and frustrating. A low-flow toilet is usually caused by a handle that is too long or a deformed hinge valve, which can easily be repaired.

Opening the toilet

Lift the rear part of the toilet and position it so that it does not fall and break. Straddle the toilet and look inside. You will see many simple parts. At the bottom is the hinge valve, to which a chain is attached. The problem is either the chain or the flapper valve.

Check the chain

First check the chain. The chain is attached to the flush arm. The flush arm is connected to the handle that is used to pull the flush from the outside. When you push the handle down, the flush arm lifts up. The chain connected to the flush arm is pulled upwards, opening the flap valve. The chain must be loosened in order to be pulled up by the arm. It should have no more than one centimetre of slack.

Adjusting the chain

Rinse the toilet while observing. If the chain is too loose during flushing and the flap valve does not lift quickly, adjust the chain at the end of the flushing arm. For most chains it is sufficient to take one of the links and hook it onto the metal hook that fastens the chain to the flush arm. Otherwise, needle-nose pliers may be needed to open one of the chain links and attach it to the flush arm. Try flushing the toilet and see if the problem is solved. 

Checking the flap valve

The other problem that can cause the toilet to flow slowly is the flapper valve. The valve may be deformed and unable to create a tight seal. To replace the flapper valve, the water flow to the toilet must be interrupted. 

Lift up the flap valve and observe the lower part. If the lower rubber rim is deformed (not completely round), it must be replaced. You can remove the flap valve together with the chain. Unhook the chain at the end where the flush arm is located. Take the flapper valve with you to a hardware or plumbing supply shop. 

Replacing the flapper valve

Replacing the valve is as easy as removing it. Place the valve over the hole and attach the chain to the flush arm. If necessary, adjust the chain so that it is not too loose. Make sure that the flap valve is correctly positioned over the hole. Switch the water flow to the toilet back on. Test the flush.

Call the Emergency Plumber in Bolton. We are 24 hours available.






Location: Bolton, UK

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