Keep getting the black greasy looking substance in the skimmer. Mostly at the water line but some where the basket or attachment for the vacuum hose meets the skimmer below the water line. Ive read its a pretty common problem and couldnt find a definitive answer on what it is.
Anyone ever try the scumball thing to get rid of it or anything else?
Anyone ever try the scumball thing to get rid of it or anything else?