I bought this primarily to preserve water and keep leaves out of my pool. It did neither. Perhaps this works ok with a small pool, but with my 15x30, "kidney bean" shaped pool, it was rather useless. Even a light breeze bunched it to one side. Also, filtering equipment / skimmers could not operate with this covering the pool. Given the size, it is extremely difficult to manage and fold or roll - it took me 30 minutes to get it folded and rolled. Given it's bulk, I would consider it a hazard to lSee full review