Is the Sun2Solar Solar Pool Cover Worth It for Heating Your Pool?

Here's the trick: those bubbles aren't decoration, they're air pockets, the same idea as bubble wrap insulation. Lay the cover flat on the water and sunlight passes straight through the clear blue plastic and warms the water underneath, the way a greenhouse roof works. Once the sun goes down, that trapped air layer stops the warmth from radiating back out, so the pool holds its temperature instead of dumping it into the night air. That's where the up to 15 degree swing this material claims comes from, and it's plausible because evaporation, not radiation, is the biggest heat thief a pool has. Every gallon that evaporates carries heat away with it, and a cover sitting flush on the surface cuts that evaporation sharply, which is also why it quietly saves water and the chemicals you'd otherwise dump in to replace it. The debris blocking is really a side effect of the same flat seal, nothing falls through if nothing can get past the surface. The 12 mil thickness of this 1200 series is the tradeoff point: thick enough to hold heat and survive UV, thin enough that one person can still drag it on and off without a fight.