More info is needed. Do you have an IG or AG pool? (It would help if you filled in your profile). Do you want to increase the temp a little or are you looking for a substantial increase or extend your season? What direction does your roof (or wherever you plan to put the panels) face?
A good understanding of solar can be found at www.powermat.com. The info there is primarily for permanent installations for IG pools, but is a good starting point for understanding how solar works and how it is plumbed into your pool.
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