Aquatabs 397 mg tub - 100/unit

World's Best-Selling Water Purification Tablets: Aquatabs offer an easy, reliable, and cost-effective way to maintain freshwater systems on boats, RVs, and for outdoor or emergency use. EPA registered and NSF certified. Kills Microorganisms, Prevents Waterborne Diseases: Drop one tablet per four gallons of water, wait 30 minutes, and enjoy fresh, safe drinking water. Eliminates "Rotten Egg" Odor: Sodium dichloroisocyanurate releases safe chlorine when mixed with water, disinfecting your boat or RV plumbing. Time-Release Protection: Aquatabs continue to release chlorine for weeks, providing ongoing protection against microorganisms.