I just use 200 micro socks to clean my sand. I get my gravel cleaner and put the end into one of the filter socks and clean the sand, which I just clamp down on the hose with my fingers to "regulate" the suction so I do not suck up any sand into my filter socks. After im done cleaning the sand and stuff, I just replace the filter sock since its clogged up with just detritus. I haven't owned a 100 micron or less filter sock so I cant say anything about those and I switch out my filter socks every 3 or so days.