[quote=JPJones]Relevant to heating the pool using “solar”, my grandfather, who grew up during the depression, had an interestingly cheap way to heat his pool. He bought a black garden hose and ran it from the pool pump around the back yard through areas exposed to direct sunlight, then back into the pool. He’d let it run at a trickle during the day and we never saw the pool go below 75 F, even during the winter.[/quote]
Same friend also suggested that the electricity to run the pool pump was a significant portion of his electricity needs. So, your plan isn’t a bad one because it saves heating costs, but not pumping costs.