The principle of a pool anti-freeze pillow is based on its unique design and material properties. The pillow is typically made of a tough and flexible PVC material.

    When placed in a pool before freezing temperatures set in and inflated, it occupies a certain volume of space within the pool. As the water in the pool starts to freeze and expand, which usually exerts significant pressure on the pool walls and floor and can cause cracks or other damages, the anti-freeze pillow acts as a buffer. It absorbs the force of the expanding ice by compressing and deforming slightly itself.

    This way, it redistributes the pressure, preventing the pool structure from bearing the brunt of the ice expansion and thereby safeguarding the integrity of the pool throughout the freezing period.