Rapidly dissolving effervescent tablets for treating stored water. Manufactured to strict specifications to ensure an accurate dose. The Quest Aqua Tabs have a formulation containing dichloroisocyanurate, an organic chlorine donor with superior disinfection capacity. Approved by the WHO for drinking water purification. Purifies water - rapid dissolving. Foil wrapped - for protection when not in use. Organic chlorine donor. Superior disinfection capacity. Each tablet purifies 25L of water. Remain stable for 5 years plus. Certified to NSF/ANSI 60 Standards.