I used to use them, but the clogging in short time and cost wouldn't make sense. My solution was to find something that would clean the water mechanically pretty close to socks, but not so expensive to throw away Ina few days. I buy chemical-bags, the mesh bags that are used with chemical-pure, which are double stitched, and very very fine. I usually hook them to the overflow end hose that feeds the sump with zip ties. They last 1-2 weeks, and in case you are concerned if they filter well, a few minutes after you place them, you will see stuff, detritus getting trapped already.
They are cheap, buy online for 2 dollars per pair.