Solar pool covers
Good friends of mine are looking at buying a solar pool cover for their 24x40 foot pool. Options are the one piece plastic cover, which they have been told to cut into 3 pieces to make it easier to handle, or buying 8 of the disc shaped plastic covers and placing them around the pool. They are leaning toward buying the one piece cover, cutting it into thirds, and then just dragging sections out of the pool when they want to swim.
Any thoughts? Are these covers effective? Pool is located in Southern California. Thanks!!!