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Thread: Sta-rite PLM100 filter losing pressure.

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    Sta-rite PLM100 filter losing pressure.

    I have a Sta-rite plm 100 that is 5 years old. The old filter was extremely dirty so I ordered a replacement. The new filter doesn't seem to sit quite right and I get absolutely no pressure or suction. My system runs great without the filter in, but as soon as I put the filter in I lose suction. I was told it might be dirty, but the old extremely dirty filter worked just fine. Any ideas would be appreciated. I can't find any information or diagrams on line that have been helpful. Local pool techs are stumped and I even called Pentair, the manufacturer and they have no clue. Thank you.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Sta-rite PLM100 filter losing pressure.

    Welcome to TFP.

    What doesn't seem right about the new filter. Size, shape, etc? If you set on a flat surface and run water in it does the water run out quickly?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Sta-rite PLM100 filter losing pressure.

    sorry for the delay replying, but we lost power Friday and just got it back. The replacement filter is correct. it seems that something in the filter housing may be slowing the water flow when we put the cartridge in it. The cartridge sits over the outlet and we seem to be getting a lot of water backing up there, but when we put the cartridge on, the water flow slows down. I just figured this out, then we lost power so I haven't been able to investigate this possibility.

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