Hint for small pools: if there is elecricity nearby, submerged pump + long dark garden hose laid on ground and back to pool, on sunny day it warms water quite efficiently. I have had also a couple of black roofing sheet on ground and garden hose back and forth over those sheets. Kind of DIY solar panel heating.
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Photo: Oasis Video - 40's Retro Dress in Pool7/10/20report