Solar would be good for your pool, but would it get too warm, during the summer?? When I was younger, we used to super heat our bodies in the sauna, then dive in the unheated cold pool during the winter. That was always good. I don't have a pool, just a jacuzzi, and a sauna. Hey, maybe I could do a refrigerated cold pool, to go along with the sauna. One of the health spas I belonged to at one time, had a small circular cold pool; they tiled it over after the second death (heart attack). The water temperature was about 40. Only a healthy, in condition person, should ever try that; it's quite a shock to the system.