Micro-Soak L (AFCO 4440) is a non-metabisulfite membrane preservative designed for soak applications (temporary shutdown). This unique product avoids the disadvantages of metabisulfite powders - namely pungent odors of both product and diluted solutions, common product hardening problems, as well as the corrosion potential to system components. AFCO 4440 can be conveniently dispensed by automatic equipment for ease of handling and accurate control. USDA authorized as P1.