had new bathroom suite put in last summer, but recently after flushing loo there is a loud sort of bonk noise, called the guy out he checked pressure and valve but cant tell me what the prob is any ideas?

Eileen Smith, February 2010

thanks for info. the guy tried that seems to be ok but noise still there will have to get second opinion!

Eileen Smith, March 2010

Some say glue a polistyrene tile to the bottom of the float ball ensure is is not catching on the tank sides this adds to the float area and can stop the 'bounce' that causes bonking or knocking.

Bob, March 2010

Depends where the "bonk" noise is coming from,it could be your stopcock,find the main stopcock in the house and hold it while someone flushes the loo,you may feel it knock when the loo finishes filling or hear the bonk noise more clearly in that area,if so turn water off and only open the tap enough so you have pressure but not fully on,the spindle in old stopcocks wear and causes it to rattle making this sound,the sudden stopping of the water flow makes it rattle.Don't know if this will cure it but you have nothing to loos(pun)by trying it,you can always re list your question.Good luck.

Rich, February 2010