Keep your pool warm and your wallet unscathed by lowering your electricity bills this season with the 9-pack of Solar Sun Rings Swimming Pool Spa Heater Circular Solar Covers. Solar sun rings are much easier to set up and take down than regular pool covers and save you money in the process. The solar cover works by using sunlight to heat the pool throughout the day while the thermal blanket effect helps the water retain heat during the night.The cover also reduces the evaporation of water and chemicals, so your pool chemistry stays intact longer. The redesigned inner grid contains added drainage grommets, which allow water to seep through the Solar Sun Rings without sinking. Dirty pool? Simply move the rings around while cleaning your pool instead of going through the hassle of removing them all. For the best performance, clean the rings monthly with a simple solution of water, pine cleaner, and vinegar. One ring per 50 square feet of water is recommended to fully heat your pool.Enjoy your pool without worry with the 9-pack of Solar Sun Rings Swimming Pool Spa Heater Circular Solar Covers.