My pool was officially opened yesterday(H2O-60 degrees-brrrrrrr!) Anyway, I checked the skimmer baskets after it was on a while and found one filled with something that looked like white lava rocks inside. I imagine it is something dissolving into the pool but what is it? Usually they leave the empty containers for me to dispose of but this time they didn't so I have no idea what it is. Any ideas? I was also ****** to fine they didn't shock the pool. They always used to. My FC was .5 today and it was crystal clear when we took the cover off. But I digress.