FSS ProGuard Dry is a multipurpose corrosion Inhibitor and system Biostatic bacterial inhibitor designed specifically for Dry and Preaction fire sprinkler systems. Huguenots unique formulation protects system components by placing a protective barrier coating on all metallic components while not harming gasket materials commonly found in these types of systems. Huguenot Laboratories ProGuard Dry system treatment program is designed and formulated for use in Dry or Preaction water based fire sprinkler systems. ProGuard Dry is for use in steel, galvanized, and cooper based fire sprinkler systems. This treatment program is not authorized for use in CPVC style systems.