How do you clean them ? Or do you have to continue to purchase them?
Just take the basket out, dump the large trash out, and wash out with a hose with a pressure nozzle on it. Put the nozzle on a "lighter" setting - a jet spray can put a hole in the sock.

I only have to replace them because of tearing holes in them, which happens - otherwise, you can wash all the scum out. They will clog up a lot faster than a filter will (I have a cartridge filter) and need more attention if your pool is dirty.

But I love using them.