not to sound like an Ahole, but Ive been servicing pools for 16 years & solar covers are no good for a pool. I have to admit, they do heat the pool extremely well, but they shed off the little bubbles (as they break) and then they clog your baskets & filter grids. The cover also stops the top layer of your water to suck into the skimmer, which helps clean your pool.
2 years ago I tried a product called Solar Rings in my pool. They have been extremely impressive, & heat my spa tremendously. They come in 3 sizes (5ft circles is the most common), they just float ontop of the pool & heat the water to 21,000btu & when your not using them, you can fold them into a plastic container. They have been the best seller in my store this summer.