Unique Pool - Closing

You don't need an air pillow, you essentially have an in-ground pool. Regardless air pillows aren't needed in above grounds either. They won't explode if you use don't use an pillow. Remember the air pillow is filled with air so maybe an inch at the most is actually submerged in the water upon freezing. I've seen an above ground pool lose it's winter cover on a windy day and the pillow came off with it, so how much expansion is it truly absorbing? Most above ground pools are designed to be very strong at holding water pressure as an outward force, but if you were to drain that pool you could easily kick the pool wall in from the outside.

Back to your original question, no you don't need a pillow, but you might want to pick up a cover pump or even an automatic cover pump (i.e. Rule) to keep excess water off the cover before and after winter.
 
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