One packet works in spas up to 600 gallons.
For periodic shocking, use FROG Maintain, it’s one dose in one single easy-to-pour pouch for one easy maintenance shock to keep your water crystal clear. No measuring, no guess, no mess. The hot tub is ready within 15 minutes of shocking. Once in the water, Maintain quickly dissolves and eliminates organic contaminants. Non-chlorine shock means your tub gets clean without any Cyanuric Acid, ever.