Are they mesh, or felt. Mesh should last a week or two easy, I just hose them out in my laundry tub then put them back in.
Felt socks are barely going to last a week, and are a huge PITA to clean unless you put them in a bleach wash/double rinse in a machine.if the sump is setup with a settling area you could go without them, but I wouldn't take a risk clogging the return unless the settling chamber catches everything