Extend your swimming season with our solar pool cover This pool cover sits directly on the water surface, within the pool edges, and can therefore increase the temperature of the pool water by up to 1 °C, depending on the amount of direct sunlight. With PE bubbles all over the surface, the heat is retained for much longer. This cover is the most cost-effective way to heat your pool. At the same time, it helps reduce chemical consumption as well as water evaporation. The cover is lightweight yet durable. It can be cut to size to fit smaller pools.