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Thread: Return Pipe Angle

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    East_Akl_Neil's Avatar
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    Apr 2012
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    Return Pipe Angle

    Hi All

    I'm currenty redoing all the pipe work on the pool. I have a quick question. If the return from the Multiport to the pool eye is of an angle to allow the water to drain out of the pipe into the pool when the pump is off, will that cause the remaining water to drain back via the filter and pump back to the pool causing it to have to prime the pump each time the pump is turned on, or will it be Ok and the water wont flow back.

    I can change it easy now as I've yet to start that side of the plumbing, but dont want to over complicated it if I dont have to.
    Late 1970's 39000L IG Concrete Pool with Vinyl Liner
    Austral FT55 Sand filter
    Hurlcon E170 Pump Brochure,Manual
    32-40mm Pipe work
    Living in beautiful New Zealand

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    duraleigh's Avatar
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    Re: Return Pipe Angle

    Good question. If your circulatory system is leak free, the water will stay in the filter and pump and it will prime immediately.

    Getting your system completely leak-free can be a challenge but it is doable and your pump will always be primed.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    East_Akl_Neil's Avatar
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    Re: Return Pipe Angle

    Thanks duraleigh. One thing that I did forget to mention was that the return is sometimes above the water line, so it could be easy for the water to drain out when the pool water gets a bit low.
    Late 1970's 39000L IG Concrete Pool with Vinyl Liner
    Austral FT55 Sand filter
    Hurlcon E170 Pump Brochure,Manual
    32-40mm Pipe work
    Living in beautiful New Zealand

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    duraleigh's Avatar
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    Re: Return Pipe Angle

    If the return is above the pool water line and below the pump, you lose prime every time. Why is your return so high?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    East_Akl_Neil's Avatar
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    Auckland, New Zealand
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    Re: Return Pipe Angle

    Its the way it was built 40 odd years ago. The old plumbing was ok, but that was a mix of 32mm, and 40mm PVC and plastic pipe. Im replacing the skimmer and upgrading the plumbing to 50mm where posible, as the filter can only take 40mm. Im also installing solar as well while Im at it.

    Im begining to think that a non return on the suction line is going to be the only way to resolve the issue, untill such time that I replace the liner and install 2 return lines below water level at the same time. (I want to move the skimmer at that time, but the budget does not allow for that as yet).


    Late 1970's 39000L IG Concrete Pool with Vinyl Liner
    Austral FT55 Sand filter
    Hurlcon E170 Pump Brochure,Manual
    32-40mm Pipe work
    Living in beautiful New Zealand

  6. Back To Top    #6

    Re: Return Pipe Angle

    As long as it's a self priming pump, it should catch prime fairly quickly from water left in the pump strainer housing.

    You could add a check valve between the pump and filter or after the filter.

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