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Thread: Index Sand Filter Problem

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    Index Sand Filter Problem

    When my intex sand filter is running it gets all the air out of the system, but when I turn it off, a bunch of air comes from somewhere and fills up half of the area with the clear lid and leaf basket. What could be causing this? The intake and output are both underwater and there are no leaks in any of the connections.
    Intex 15X48 metal frame pool

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    Isaac-1's Avatar
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    Re: Index Sand Filter Problem

    Is your filter or pump mounted at above pool water level?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Index Sand Filter Problem

    Quote Originally Posted by Isaac-1 View Post
    Is your filter or pump mounted at above pool water level?
    No, it is below on the ground.
    Intex 15X48 metal frame pool

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    duraleigh's Avatar
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    Re: Index Sand Filter Problem

    The pump can be pulling in air from the suction side. The air then compresses in the top of the filter and, when you shut off the pump, the compressed air pushes back and some of it stays in the top of the pump basket.

    I think you have a loose fitting or something that is allowing air into your suction side. I can think of no other explanation.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    jeffchap's Avatar
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    Re: Index Sand Filter Problem

    The most common place for it to leak is the o-ring around the clear plastic lid on the prefilter basket. Make sure it's not pinched and the lid is screwed on tightly.
    25000 gallon free-form gunite
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    domct203's Avatar
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    Re: Index Sand Filter Problem

    Quote Originally Posted by jeffchap View Post
    The most common place for it to leak is the o-ring around the clear plastic lid on the prefilter basket. Make sure it's not pinched and the lid is screwed on tightly.
    +1

    Also, a little silicone or teflon based o-ring lube can really make a difference. I use Jack's 327 on all O-rings and eyeballs.

    https://www.amazon.com/Hayward-SPX03.../dp/B00CG4GMTG

    Any brand is fine, just make sure it is NOT petroleum based lube.
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