About the PoolTree System:The system consists of a heavy duty ball (1000lb+ burst pressure), unique harness, expandable bungee support straps with patented connectors, and nylon straps. When used with a mesh (porous) cover, ther system eliminates the need to scoop leaves, pump off the cover, or dump dirty water into the otherwise clean pool. There is no more fishing a deflated pillow out of the bottom of the pool.How it works:- The PoolTree System holds above ground pool covers above the water line using a unique ball system. - Rain and snow may temporarily weigh down the cover, but the water quickly drains through the mesh cover.- The tension from the stretch supports and the buoyancy of the ball pull the cover back out of the water. - Sun and wind cause the cover to dry, then leaves simply blow away before they have time to mulch into the otherwise clean pool water. - Solid covers can also be used but still need to be pumped. The PoolTree System holds water and leaves against the side of the pool so they are easy to reach, saving valuable time and frustration. - The result is a much cleaner pool than typically experienced with mesh covers. Significantly reducing maintenance after the pool is closed. - Many repeat dealers and 7 years of sales demonstrate that this system works.