If you are thinks about covering the pool in some way to save water — forget it. This is because many pools will not even be suited for a cover based on the shape.
Further, think about what happens to all the dirt and leaves that get on top of the pool cover when you have the cover on. Right, when you roll up to cover all the dirt gets rolled up with a cover over the dirt all falls into the pool creating a bigger problem.
I usually don’t say everyone, but everyone I know that as they pool cover regrets having a pool cover.
Please do not buy a pool cover for your pool if you are trying to save water.