
I've worked hard to learn how to use the sump filtration system. After a few years, a layer of brown sludge formed in my sump, which spilled into the tank whenever there was a disturbance. I got it wrong I added one of these and swirled the sump over me (bypassing the tank) and cleared out all the mud. I had to put on and clean the sock half a dozen times in one day. I've had the system fine for a day now and the water looks fantastic.

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