Abstract: A composition and a process for using the composition to treat water for clarifying, sanitizing, or disinfecting water wherein the composition comprises an active oxygen compound and one or more precursors for generating chlorine dioxide (ClO2), and the process comprises contacting water with a solid composition comprising an active oxygen compound and precursors for generating ClO2 and is characterized in that, upon the contacting, at least 10 grams of the composition can be dissolved in about 3.8 liters of water at 25° C. in less than about 60 minutes, thereby generating a solution containing at least about 40 ppm ClO2, is disclosed.

Abstract: A composition is disclosed comprising a dissolvable solid containing an active oxygen compound and precursors for chlorine dioxide characterized in that when said solid weighs a total of about 5 grams it dissolves in about 3.8 liters of water at 25° C. in less than 30 minutes, thereby generating an antimicrobial solution containing at least 10 ppm chlorine dioxide.