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Thread: Sand in return line

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    Sand in return line

    I've got an older Hayward sand filter that came with the pool when we bought the house and it is blowing sand into the pool via the return line. Is it possible to fix it somehow or does it need to be replaced?
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    Re: Sand in return line

    I have an Hayward s180t not really sure how old if is as it came with the house/pool
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    entendu's Avatar
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    Re: Sand in return line

    If you're sure it's coming from the filter, it's probably a broken lateral. They are not expensive to replace but you do need to scoop out all the sand to do the job - time consuming. If you google "sand filter lateral replace" you'll find a couple videos about it.


    20'x40' IGP, plaster, 40k gal. Full sun.
    Pentair Triton II sand filter, 2 hp single speed pump, Triton minimax plus 400 heater.
    k-2006 test kit, Polaris 9550 Sport robot

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    Re: Sand in return line

    How much sand?
    Only after a backwash?
    Only after turning the pump on?
    Continuous while running the pump?
    What type of backwash setup does the filter have (multiport or push/pull)?

    Knowing more detail may help guide you to resolve the issue.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: Sand in return line

    It appears to be only when the pump first comes on. It's enough you can see it and then slows to nothing within a minute or so (or at least looks like nothing). There is always a fair amount of sand on the bottom of the pool. It doesn't matter if there has been a recent backwash or not.
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    PAGirl's Avatar
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    Re: Sand in return line

    Are you rinsing after the backwash?
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

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    Re: Sand in return line

    Yes I rinse after for about 1 min

    Multi port valve also. I missed that question above
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    Re: Sand in return line

    You may want to check the condition of the spider gasket in the multiport first.

    To check if sand continues to accumulate, after the pump is on, brush the area where the sand settles and check again about 10-15 minutes later.

    If you do wind up having to open the filter, plan ahead and get some PVC unions to put in line near the multiport valve so you don't have to cut and glue the lines if you need to get into the filter in the future.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: Sand in return line

    Thanks,
    What is the spider gasket and what would I look for when checking it?
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    Re: Sand in return line

    Your multiport valve should have a model number on it. Knowing that number, you should be able to match up the correct spider gasket easily. The spider gasket is an internal part which seals the ports and allows water to only flow to the sections needed based on the valve handle selection.

    Here's a link to a site that can help determine the exact one you need - and a picture for reference (the one linked to may or may not be the exact one you need).
    Hayward 2 VariFlo Valve Seat Gasket - SPX0715D - INYOPools.com
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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