Hi all, I posted awhile back about what appeared to be a problem with algae when the solar cover is left on. The suggestions here were that the algae that I had prior to leaving the cover on for several days probably wasn't dead. So, with a CYA of 40, I raised the FC level to between 10 and 15 and left it there for 8 days. No combined chlorine, let the FC settle to 5 so the kids could swim. Now, it turned cold here in Atlanta, and windy so a few leaves, etc got in the pool. I put the solar cover on while the cool rainy weather was here. It lasted for better than a week, maybe 10 days, cover on all the while. I still ran the pump and checked CL. One day after a particular rain, I checked and CL was less than 3, so I added bleach to bring it to 5. Two days later, it's getting nice out again, I take the cover off to clean leaves off the bottom, and lo and behold, algae is starting to appear. It's fairly shaded by trees there, I'm thinking that may have something to do with it. What next? The water was fairly clear, just starting to get algae on the walls. Should I use some Polyquat? What about Phos-free?