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For the quick and safe removal of harmful substances such as chlorine, chloramines, and ammonium in freshwater and marine aquariums. sera Chlor•ex conditions tap water to fish-friendly, healthy aquarium water. Allows adding fish already after 24 hours when combined with sera filter Biostart (fresh water) or sera Marin Bio Reefclear (marine water). sera Chlor•ex does not affect the pH value.