Is this stuff really any help or necessary. http://www.intheswim.com/Pool-Equipment ... r-Cleaner/
Per web site:" Backwashing alone only removes large contaminants from your filter; while oils, grease, and minerals continue to build up over time, decreasing your filter's cleaning power. Adding 8 oz. this concentrated formula to your skimmer prior to each backwashing, will eliminate caked-on contaminants, allowing better filter efficiency."
We do get a lot of "gunk" in the pool- pastures and animals all around, large pollen load, ground is greasy clay, plan to try leaving pool open this winter.
I already have "ring around the pool" since the first week of filling and constantly have a scum line in the skimmer. I use a magic eraser on the pool and skimmer walls weekly, but will probably never totally get rid of the black clay stains. I am ordering scum balls and a skimmer sock, but wondered if this would be a good idea to keep my sand filter from getting gunky?