Keep your pool clean and pristine when it's not in use with the Bestway Round Pool Cover. Above-ground pool covers are a must-have accessory; they keep debris, leaves, and trash from getting in the water, prevent algae growth, and reduce the amount of chemicals you need to use to keep your water in tip-top shape. This pool accessory features drain holes to prevent the accumulation of water and stretching from the strain of the weight. A rope is built into the lining of the cover, and it can be tightened to keep the cover in place, even in windy conditions. This cover fits 4.57m (15') Steel Pro Max Pools and 4.60m x 90cm (15' x 36") Hydrium Splasher Pools.