Cover on the pool is also a floating solar blanket. Since my pool is an odd shape I do not have a reel and have to put it on and take it off manually (which is actually pretty easy to do). I did have a bit of a problem with it blowing off at first until I made sure it was trimmed to be slightly smaller than the pool and was completely floating. Now the surface tension of the water seems to hold it in place nicely. Actually, I have not used the cover on the pool since the weather got warm and just keep the one on the spa to help keep the heat in. The downside is that there is always pollen and stuff floating on the pool now that I have to skim out. With no cover on the pool and the cover on the spa I can even turn the spillover on with no problems...the spa cover just floats up a bit higher and the spillover works perfectly.