I open my pool to literally thousands of earthworms that have apparently slipped under the cover over winter. They break down, algae joins in to feed on the protein, and I am left with tons of worm bodied dark green glop that I have to net out. No way I would run that thru the filter. This season I put water bags half way around the perimeter, covering the parts that are closest to the soil level. It didn't do a thing, if anything it was the worst year yet. HELP !