When I rub my hands along the walls of my fiberglass pool, I get a chalky white substance on my hands. This has been happening all season but it seems to be worse lately. I called a fiberglass pool pro about it and he said it is a common problem with older fiberglass pools like mine, and it is usually caused by low calcium, high PH, and high chlorine levels. He recommended that I increase calcium to 300, decrease ph to 7.4, and keep chlorine no higher than 3 ppm. Does this sound like good advice? Right now, calcium is 220, PH is 7.6-7.8, and I keep chlorine at target level (4-5). Has anyone else experienced this problem and did the problem go away once you increased the calcium and lowered PH and chlorine levels? Since the water is too cold to swim in right now and we plan on closing in 2 weeks, do we need to increase calcium levels before we close or can this wait until next Spring?