FROG® Maintain™ is a non-chlorine shock that removes contaminants in the water in as little as 15 minutes. Recommended for use with any of the FROG® Sanitizing Systems for hot tubs, this simple packet makes shocking easy. With no chlorine, there is no Cyanuric Acid build up that causes hard to manage, irritating water and frequent draining and refilling. (Please see the FROG® Maintain™ directions for use).