Keep water and heat in and debris, leaves, and trash out of your pool with this Flowclear Solar Pool Cover. Above ground swimming solar pool covers create a greenhouse effect in your pool. Solar covers also prevent water evaporation caused by dry winds, or free-chlorine loss caused by UV rays. , , These covers are designed to keep water and heat in, but debris out. Extend your swimming season with a Solar Pool Cover. It fits Flowclear 13'3" x 6'7"(4.04m x 2.01m)/13'6" x 6'7"(4.12m x 2.01m) Pools.