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

    Jan 28, 2013, 08:52 PM
    Why does my toilet tank fill to the water line then slowly seep down about an inch
    My toilet tank fills to the water level then the water level drops about an inch. Once it drops an inch the black mechanism kicks in and the water level raises an inch. Our water bill was $500. What is causing this issue?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jan 28, 2013, 09:04 PM
    Leaky flapper valve. Put some food coloring in the tank, now look in the bowl. Bet the water is colored. Turn water off, remove the old flapper and get one that matches. Make sure the seat is smooth. If the seat is worn, you can get a combo flapper and seat kit or if the toilet is old, a replacement toilet.
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #3

    Jan 28, 2013, 09:21 PM
    Yup! In complete agreement with Ma0641... do the dye test and then replace the flapper... should resolve the issue.

    Mark
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Jan 28, 2013, 10:24 PM
    If you still have seepage then check the flush valve seat for nicks or rough spots. Good luck, Tom
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
    Ultra Member
    		  
    #5

    Jan 29, 2013, 01:03 AM
    If you don't have food coloring suggest to close the angle valve under the toilet tank leave it for some time if the flapper valve or the flush valve seat is bad you will see the water leveldown, do as the above experts have suggested, Thanks.

    John
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