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    donald1's Avatar
    donald1 Posts: 1, Reputation: 1
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    #1

    Sep 10, 2012, 09:14 AM
    What could be causing a black residue buildup in my toilets?
    What could be causing a black residue buildup in my toilets? I have a water softener
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Sep 10, 2012, 10:36 AM
    This could come from a flapper going bad. Run your hands around the flapper. If they come away black then replace the flapper. Let me know if that was it. Good luck, Tom
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