The rings have been discussed on here before with the consensus being that they aren't so great.
The solar covers, on the other hand, make a world of difference. The do more to keep you from losing heat overnight than actually providing a lot of heat.
If you combine a solar cover with a solar panel, that is the best way to get the water warmed up. You do not have to install the panels on the roof. Many people don't. You might want to check out FAFCO solar panels. They don't cost all that much and work well.
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Hope this helps! Welcome to the Pool Forum!
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