Hi guys, I have a 21 ft round that I just installed a month and a half a ago. I used a solar cover in the beginning of July and I started to to get a bit of a algae problem so I took it off and have not used it since. I was not filtering the pool enough. I think I was filtering about 4 hours a day. But I have since learned that you need to filter at least 10 hrs a day. My question being it is starting to get chilly here, I wanted to put the cover on again, the pool water is dipping and is about 78, down from 86. Is it ok to use it??. Will I get a algae break out again??. Can you filter with the cover on and should I take it off everyday??. I would appreciate any help with a solar cover tips, since I am new to owning a pool. I use the synergy pool chemical chlorine system..Thanks to all..