These 4' x 8' Equalizer Pillows made of 12 guage vinyl are floated on the water surface under the winter cover to serve several purposes:
- Properly located, they make it much easier to remove winter debris and to pump off excess rainwater
- As water freezes and expands, air pillows relieve pressure otherwise exerted on the pool walls
- Also known as a "pool cover air bag" or an "ice bag"
