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    Wing's Avatar
    Wing Posts: 6, Reputation: 1
    New Member
     
    #1

    Jun 28, 2007, 08:45 PM
    Plugged up Cistern?
    I have a problem with a precast cistern that was installed in 1979 that seems to be plugged up. I removed all the dirt from the top and located the square opening to gain entry. It was about half full so I decided to be a brave soul and went in.
    There was about one inch of really fine silt in the bottom and I could not find the output port anywhere along the bottom.
    I am currently draining the system and hopefully when I get out all the water I may find it.
    My question is, do most precast cisterns have a output port along the bottom edge?
    And what would be the best formulation to disinfect the tank when the repairs, and all the silt removed is complete? I was thinking a mix of clorine and water on the way out.
    I think the peoples kids I rented this property to for the last six years was the cause of the silt as I guess they used the check pipe to send stuff into the tank including some toy pieces.
    Thanks to anyone who could help with this unusual problem.:rolleyes:
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #2

    Jun 29, 2007, 04:50 AM
    We don't have cisterns in my area but I did get some specs for a typical rainwater cistern. It has a 4" inlet at the top and a 1 1/4" foot valve with a 1 1/4" female threaded connection about 16" off the bottom in the end of the tank. Chorine and water would be a very good disinfectant. Good luck, Tom

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