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Thread: Please help me to diagnose a circulation problem

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    Join Date
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    Please help me to diagnose a circulation problem

    Please help me to diagnose my water circulation issue. I have a 1 hp single speed pump that goes through a 38 sf Anthony Apollo DE Grid Filter. Up until now the whole system was pumping fine with good suction at the skimmer and a good flow at the returns. Yesterday I backwashed the filter prior to adding CYA to the pool and when I was finished the pressure was 12 psi at the filter (which is normal after backwashing). I ran the pump all last night and all day today to let the CYA dissolve and when I checked the pool after work today at 5:30 PM, the system seemed to be running fine and the pressure at the filter was 10 psi. At 6:00 PM, the system shut off automatically as it was programmed to do. I turned the pump on manually to allow more time for the CYA to dissolve and the pressure at the filter was 0 psi. You could hear water moving through the pipes, but it was moving significantly slower than normal. The flow at the returns was approximately ΒΌ as strong as normal. Is this a pump issue, or is there a blockage in one of the lines?
    ~20,000 gallon IG gunnite pool
    40 sf Anthony Apollo DE Grid Filter

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    Mod Squad JohnT's Avatar
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    Re: Please help me to diagnose a circulation problem

    It sounds like you have an air leak that isn't letting your pump fully prime. Check the strainer basket lid gasket and your skimmer weir for free motion. Check that the water level is up far enough in the skimmer to avoid a vortex in the skimmer. Finally make sure all the valves for the skimmer and drain are open.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Please help me to diagnose a circulation problem

    John,

    Besides the things that you said, how would you troubleshoot an air leak in the suction line?

    Thanks,
    Scott
    ~20,000 gallon IG gunnite pool
    40 sf Anthony Apollo DE Grid Filter

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    Re: Please help me to diagnose a circulation problem

    Milamber,

    Is there visible water in your pump basket strainer? Is it partially filled with air or just water?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Please help me to diagnose a circulation problem

    Duraleigh,

    It's filled with water. Is it possible that the problem could be caused by a blockage because of too much DE in the lines? I recently backwashed and am not sure if I added too much.
    ~20,000 gallon IG gunnite pool
    40 sf Anthony Apollo DE Grid Filter

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