I bought this large 100 micron gasket in lieu of replacement filter cartridges on a whim a few months ago and am totally impressed. I know buffing pads aren't designed for this use, but I'll take apart the manufacturer's cartridges and build my own using that cloth, charcoal, and hot glue. Then I put the sponge/fiber on the suction side so that large dirt particles can get caught in it. Smaller particles are retained on the micron pad. It works incredibly well and my fully stocked main tank is nearly pristine despite the fat dwarf gourami defecating 24 hours a day, 7 days a week. my 2 tanks) and haven't even used half of the cloth yet. The material is strong enough to withstand multiple rinses and spins before needing replacement, which is as easy as cutting a new square out of a large sheet of paper. The boxes should easily last a year or more for a 10-30 gallon filter. 10/10 I will buy more when I run out.
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