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    JCMURPHY's Avatar
    JCMURPHY Posts: 1, Reputation: 1
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    #1

    Jun 4, 2008, 01:39 AM
    Loud Knocking Noise After Flushing Toilet
    I flushed my toilet and it made this terrible knocking noise for abou 5 minutes striaght even after it was flushed. It was so loud I couldn't believe it.

    What could be wrong?
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Jun 4, 2008, 03:59 AM
    Quote Originally Posted by JCMURPHY
    What could be wrong?
    Seems there is a problem with air in the system. This happens when the pipe to the roof is blocked and/or the main sewerage waste pipe itself is blocked (a frequent situation if you have your own drain system. Start opening the pipe covers and check if there is a block somewhere.

    A dirty job, but someone has to do it !!!

    :)
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    Jun 4, 2008, 06:54 AM
    The prevoius answer regarding the evnt stack is not your issue. A vent stack would not make noise for 5 minutes. I am asking myself if its possible you have exaggerated that 5 minute a bit since the toilet should complete refilling in a about one minute. Could you test the situation and time the noise length? It may help us find your problem, I susoect a faulty washer in your ballcock.
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