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    Mardicu's Avatar
    Mardicu Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 5, 2012, 08:27 PM
    Mysterious fog horn
    Whenever we use any water in our house we hear
    This 'foghorn' sound it lasts only about 15 to 20 seconds. Any
    Thoughts as to what is causing this? Just started today.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jul 5, 2012, 08:31 PM
    Could be the pressure reducing valve or a ballcock in a toilet. Try to pinpoint the sound by going to the PRV and listening. Just replaced one for a customer and that was the exact symptom.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Jul 6, 2012, 07:37 AM
    Pop the lid on your toilets and check the tank level. It should be about 1/2" below the top of the white overflow tube. Good luck, Tom
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