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CrystalClearÂ® Algae-OffÂ® utilizes the latest in oxygen technology to remove string algae quickly and efficiently. CrystalClearÂ® Algae-OffÂ® is an EPA registered, granular algaecide that works in seconds, adds oxygen to the pond, removes odor and is the only water treatment product on the market with a money back guarantee. Contains a 50% chemical solution of sodium per carbonate.