I tried a skimmer sock (knee high nylon) the other day and was AMAZED at what it picked up. There was this thick slimy gunk on it after just a couple of hours. I rinsed it out and put it back on. I forgot about it till the next morning, but when I checked it again, same thing. Thick layer of sand colored slime. I threw that one away and didn't put a new on one yet.
Do you all keep yours on all the time? Or just do it every once in awhile?