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Thread: Cartridge Replacement and Filter O-Ring

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    Join Date
    Jan 2014
    Naples, FL

    Cartridge Replacement and Filter O-Ring

    Update as of 7 PM EST
    I am not longer getting the drip now however, still would like to know where the O-Ring goes. I ordered a replacement since it was missing.

    Hello All,

    I am very frustrated when trying to replace my old cartridge which is a Unicel C-8409 with the same Unicel C-8409. It seems the newer ones (and I've tried two of them) don't fit? When I'm turning the pump to a lock position, it sounds like I am scraping plastic as I am tightening it to the very end. So I ordered a Pleatco PA-90 Microband and that seems to fit better. However, I've noticed on the Unicel and Pleatco that I am getting a drip from the top part of the pump. It's dripping right near the Sta-Rite Locking Mechanism and causing a puddle of water at the bottom of the pump. After further examination, I ordered an O-Ring because that looks like it's missing, but I honestly have no idea where it's suppose to go? I don't even know if that's why I'm getting a drip or if the filter still doesn't fit but if anyone has any pictures of where the O-Ring goes, that would be great and I'll try that first.

    BTW, I am 99% confident I have a Sta-Rite PXC-95 because the C-8409 has always been the cartridge when replacing, but the label in the back has 3 models. PXC-75, PXC-95 and something else which is also frustrating so....

    Thank you for your help.
    Last edited by Nick's Pool; 03-05-2014 at 07:00 PM. Reason: Update - No more drip
    Size and Type : IGP, 7500 Gallons
    Finish: Wet Edge Satin Matrix Finish (pebble), Cartridge: Unicel Model C-8409, 12 PSi, Pump: 1.5 HP A.O. Smith Model USQ1152 (not sure if it's two speed or variable), Pool Date Remodel: May 2009, Accessories: SWG Auto Pilot Digital Nano Model 75041, Rock Waterfall

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