I have them on my tank. Yes i agree that they clog up fast, but for good reason. I am impressed with the amount of gunk they filter out of the water prior to it decomposing and adding to a nitrate problem. Mine last about 5 days, and i have 5 of them. I turn them inside out, toss them in washing machine with nothing else, run a hot cycle with extra rinse. Every second time they get washed, I dump in a bottle of hydrogen peroxide. They come out clean, and still last for 5 days like a brand new one does. I have my tank return plumbed in to the sock at a 45' angle, discharging 3/4" below water surface. This way, when it does plug up and I miss it. It calmly overflows back into sump without making a mess all over. I love using them. I didnt have them on my old tank and wish I did! Most particles that filter feeders consume are considerably smaller than 200 micron, the size of sock that I use. So the small particles stay in the water column when they pass through the sock.
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