Like mentioned above, if I notice i have some crap floating around I'll take a filter sock and fix it around my return drain for a few hours. But my sump is pretty much detritus free, a little sand from a few rocks I've put in there but there really isn't any detritus, the flow doesn't let it settle so the protein skimmer does a pretty good job at removing most of it. What ever is left becomes copepod food.. Or trochus snail food lol I have a ton of baby trochus in my sump.