Keep your pool protected and reduce maintenance costs.This 18 Foot Round cover accommodates round metal framed swimming pools, as well as similar pools from other manufacturers. This cover floats on the surface of the water and reduces water evaporation by 95 percent. It also uses the natural power of the sun to warm your pool water. Keep leaves and debris from entering pool and reduce maintenance | Winado | | 18FT Round Winter Cover Only for Above Ground Pools, Heavy-Duty Solar Round Pool Cover for Outdoor Garden Swimming Pools | Blue | Best Buy