Round 16 Mil Solar Cover is Ultimate in Pool Heating. The 21 ft round 16 mil ultra solar cover is the most economical and environmentally friendly way to heat your pool by up to 18 degrees. Utilizing thousands of tiny air pockets and an aluminized bottom layer, this round solar pool cover captures the energy of the sun and transfers that energy to your pool's water as heat.

To enhance the durability of your solar cover:

Put away your solar cover (covered or in a shady location) when shocking the pool
Place cover on the pool only when chlorine level is below 2.5 ppm
Place cover on the pool only when pH level is above 7.2
Remove sticks and leaves gently and clean the cover if dirty
When storing a solar cover on a reel, use the Poly Tarp or the Solar Cover
When storing a solar cover folded, place in a shady area or inside

Features:

Round 16 mil solar cover is made of a highly durable vinyl resin, it won't fade or disintegrate from the sun's UV rays
Cover acts as a great insulator, trapping heat and reducing evaporation and chemical loss
Highly durably yet easy to cut with scissors for a perfect fit on custom and kidney shaped pools
Solar cover can be used on its own or in conjunction with a pool heater
Economical and environmentally friendly
8 Year manufacturer's warranty

In The Swim - Ultra 21' Round Grey Solar Cover, 16 Mil