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Rx Clear® Swimming Pool Algaecide is easily our most economical and popular algaecide. When used once a week, this product offers best results in killing green, blue-green, mustard, black and over 20,000 other strains of algae. The non-metallic, non-foaming formula is not affected by your pool's pH and will not stain pool surfaces or blonde hair. The formula's polyethylene dichloride coats the algae cell and prevents carbon dioxide from getting in, which kills the algae quickly.