After we had last year a pool risen, we have considered this year on how to raise the water temperature by a few degrees. As a low-cost solution, we have these solar ordered us tarpaulin. It works flawlessly! At the recent very hot days we had the plane been removed by noon, otherwise the water was too warm (> 30 degrees). The plane makes a stable impression and can be rolled up well. We use it fitted with a double PVC rod M20 from the electrical department of the hardware store. So you can store the film well without buckling.
