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So what happens if you've already closed your pool but the weather has warmed up again? Algae loves warmer temperatures, but you can pour a little bit of liquid chlorine under your pool cover to help kill any algae that might Bloom into hotter weather once it's circulated. Add a Polyquot algaecide to your water to keep algae at Bay Throughout the off season, follow us at swim University for more pool care tips Throughout the year.