Reduces heating costs by up to 70%. Decreases water evaporation by up to 90%. Lowers chemical consumption. Suitable for Easy and Frame pools. Keeps the swimming pool clean. Note: The solar cover has small holes in the center. This is important to allow for an exchange between air and water; otherwise, there is a risk of the water turning green. Another important reason is that the solar cover could otherwise sink in the water during rain. For maximum effectiveness, the air bubbles should face downwards. The solar blanket - pool cover lies directly on the water and significantly reduces water evaporation while protecting the water from contamination. With reduced evaporation and heat gain, the costs of the solar blanket - pool cover are recouped within one swimming season. Fits Easy Set and Frame Pools (Ø 366 cm).