I am crippled with Osteoarthritis, so wrestling with a full size, one-piece cover is not really an option, but I would like some sort of evaporation barrier (the sun in this area is vicious).
Those rings (if still made) would probably be better than nothing, and, if they do actually heat the water, so much the better.
Anybody have experience with these? Are they a pain to deploy and retrieve? Do they fall apart after 2 seasons of sun 350 days/yr.?