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Thread: Back pressure on filter

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    Back pressure on filter

    Hi. I have a back pressure problem. I recently sealed the connections just before the pump, and the cleaner went working normally. But I have back pressure when the pump is switched off. Pool service nearby advised it could be my filter sand. But I replaced the sand 2 months ago. Is there advice you can offer on the breather pipe in the filter? The cleaner is no longer working as it should. The diagnosis from the pool service centre is that the breather pipe was not placed back properly and therefore causing back pressure and finally causing the cleaner to default. Please help. Thanks.

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    Mod Squad Jimrahbe's Avatar
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    Re: Back pressure on filter

    NHP,

    Welcome to TFP... A Great resource for all your pool questions...

    I assume that you believe that you have back pressure because the gauge on the filter has a reading when the pump is off...

    If this is true, then the most likely problem is the gauge itself.

    If water flows through your filter and into the pool when the pump is on, it would be impossible for pressure to remain in your filter.

    If I have misunderstood the problem, please try to provide a little more detail about exactly what is happening..

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Mod Squad JohnT's Avatar
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    Re: Back pressure on filter

    Welcome to TFP!

    I think you are referring to air building up in the filter causing water to flow backwards when the pump shuts off. This is caused by a leak on the inlet side of the pump or a problem with water flow into the skimmer or vacuum hose.

    Is your pump strainer basket full to the lid with no bubbles?
    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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    duraleigh's Avatar
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    Apr 2007
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    Re: Back pressure on filter

    I think you are referring to air building up in the filter causing water to flow backwards when the pump shuts off.
    I agree. You have a suction side leak. You didn't get all the air leaks out of the suction side.

    With the pump on, air flows into the pump where it is forced into the filter. It resides in the top of the filter and the pump pressure keeps it in there. Pump off, the air in the top of the filter decompresses pushing water backwards out to the pool. The gauge should return to zero. find that leak and that backwards flow will stop.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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