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Nature2 DuoClear Mineral Cartridge for DuoClear Pool Sanitizers cars SHARP ABRASIVE GRAIN: Silicon carbideNature2 DuoClear Mineral Cartridge for DuoClear Pool Sanitizers Replacement mineral cartridge for all DuoClear 25 vessels except limited Destroys bacteria and controls algae using natural minerals Reduces potential for stinging eyes, skin irritation, and unpleasant odors Will not harm pool equipment or stain pool Helps stabilize pH levels 6 month GUARANTEE, Kills bacteria, controls algae Replacement mineral cartridge for all DuoClear 25 vessels except