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Pro Products Neutra Sul HP41N Pro Grade Oxidizer (1 Bottle) - PRO-PRODUCTS-HP41N Pro Products HP41N removes hydrogen sulfide (rotten egg smell) from your water more powerfully than chlorine or potassium permanganate. Pro Neutra Sul is certified to meet NSF/ANSI Standard 60 for drinking water additives. Do you have an unpleasant odor in your drinking water that you cannot easily treat Pro Neutra Sul offers a safe, cost-effective solution to your problem.