If you live in a climate where winter air temperatures drop below freezing, the first accessory you’ll need before covering your swimming pool with the winter pool cover is an air pillow. Air pillows absorb the pressure created by freezing water and protect your pool’s walls and liner. As the water in the pool freezes and expands, it will freeze inward on the air pillow rather than outward on your pool walls.
Air pillows are placed under the winter pool cover on top of the water in the center of the pool. To ensure that the air pillow doesn’t move out of place over the course of the winter, you’ll want to use durable string, cord, or twine to tie it to two sides of your pool wall.
