thanks for the info i will be ordering the pillow soon , so only one air pillow is needed as
u mentionned 4 x 8 ft only 1 is required for a 21 foot pool ? also does it have to be positionned in the middle ?
also need some feedback on , what if i do not put a cover on my pool is that ok ? and if i do not cover my pool
should i be putting the pillow in as well ?