MIC Treatment Chemicals

for microbiologically influenced corrosion in fire sprinkler systems


Introducing the first and only UL-listed corrosion and bacterial inhibitor to address Microbiologically Influenced Corrosion (MIC) in fire protection systems!

FSS ProGuard 295UL

MIC Preventative and Corrosion Inhibitor for Fire Suppression Systems

UL CertifiedHuguenot Laboratories FSS ProGuard 295UL is a unique proprietary formulation of nonhazardous corrosion inhibitors that provide maximum protection of “hard-to-reach-areas.” This highly inhibited and bacteriostatic technology allows for long term superior corrosion protection of air gap areas that are typically found in wet and dry sprinkler systems. When FSS ProGuard 295UL is placed in a hydrostatic environment, it provides unsurpassed corrosion protection in water and air interface liquid levels. FSS ProGuard 295UL acts as a Corrosion Inhibitor and MIC Preventative protecting complicated values and the interior surfaces of piping and sprinkler components often difficult or impossible to reach. FSS ProGuard 295UL is non-flammable, non-odor, non-nitrite, nonhazardous, biodegradable, is specifically formulated for use in a wide temperature range, and is nonfoaming at room temperature and typical use concentrations.

FSS ProGuard 295 UL is the only product that meets the treatment requirements of NFPA 13 Standard for the Installation of Sprinkler Systems, 2019 Edition, Sections 5.1.5 and 7.8.1!
5.1.5 Water Supply Treatment. (2) Treat all water that enters the system using an approved bacterial inhibitor. (2) Treat all water that enters the system using a listed corrosion inhibitor.
7.8 Additives and Coatings
7.8.1 Additives to the water supply intended for control of microbiological or other corrosion shall be listed for use within fire sprinkler systems.


Appearance: Clear, colorless liquid, odor nil.
Specific Gravity: 1.17
Flash Point: None
pH (0.4%BV in DI Water): 9.4 - 9.5
Biodegradable: Yes
HMIS (As-Dosed @ 0.4%BV):  0,0,0

Weight: 30 Gallon Plastic Drum:  293 pounds Net
Dimensions:  30 Gallon Plastic Drum: 19.25” Width, 30.25” Height



Use Information: 0.4% By Volume with Water (4-Gallons per 1,000-Gallons)
Temperature Range:  Operate between 33°F and 150°F sprinkler water

Contact Time: Contact Time is best achieved after the system has been properly cleaned. A minimum a 4-hour soak time is recommended for dry or preaction fire systems. 

Precautions:   Solutions are eye and skin irritants, and prolonged or repeated contact may cause irritation. Mists are irritating to the skin, mucous membranes, and upper respiratory tract. Read the entire SDS for a more thorough evaluation of the hazards. For industrial and commercial use only.

Overall, exposure to ingredients in the FSS ProGuard 295UL Corrosion Inhibitor formulation does not pose a risk of adverse effects in humans or the environment following short-term, episodic exposure scenarios as outlined in UL 2901. 
ToxServices, LLC - Washington, D.C. 20036 – April 2019


Additional Microbiologically Influenced Corrosion Products

MIC inhibitor FSS Proguard

FSS DeRust


FSS ProClean D3

FSS ProGuard Green D3

FSS ProGuard Green

FSS ProGuard Dry

“One product cannot do all”

Our research and development department continues to validate and prove this time tested philosophy. The portfolio of treatment and cleaning technologies continues to grow. Huguenot Laboratories has developed three new series of cleaners used specifically for cleaning fire sprinkler systems.  The cleaners range from industrial based cleaner/sterilizers to heavy duty sludge and rust removers. The cleaners are highly effective at providing a sterile clean environment. Once a fire sprinkler system is properly cleaned, a secondary treatment of a specialty corrosion inhibitor and a food grade sterilant is applied.

The FSS-ProGuard Green™ is a unique proprietary formulation of highly concentrated corrosion inhibitors that provide maximum protection of hard to reach areas. This highly inhibited technology allows for long term superior corrosion protection of hard to reach areas that are typically found in wet and dry fire sprinkler systems. This product when placed in a hydrostatic environment provides unsurpassed corrosion protection in the water, air interface areas. This corrosion inhibitor protects both new and existing fire protection systems from internal corrosion, including microbiological induced corrosion (MIC). Huguenot Laboratories Inc.  FSS- ProGuard Green™ GRAS approved, environmentally friendly, proven liquid formulation can be safely injected into wet, dry, and preaction fire sprinkler systems. This unique corrosion inhibitor completely dissolves in water. As FSS-ProGuard Green™ is added to the water that is introduced into the fire sprinkler piping, the inhibitor chemically reacts with the iron in the pipe to form a protective biostatic barrier that shields the pipe’s water/metal interface from corrosion. This protective barrier film provides long term protection against future corrosion.

The FSS-BioGuard™ product line are a surface active formulation balanced for maximum long term mitigation against bacterial growth and MIC (Microbiological Induced Corrosion) by creating a bio-static barrier on internal surfaces of pipes in fire sprinkler systems. The FSS-BioGuard™ product line provides long term, excellent protection to control bacterial growth. MIC can create an environment where corrosion rates are elevated due to the presence of bacterial created acids and deposits. This corrosive condition can limit water flow, plug sprinkler heads, and create pinhole leaks. The FSS-BioGuard™ product line is designed to quickly provide a sterilized environment that is attainable for an extended period of time. FSS-BioGuard™ products are specifically formulated for an extended shelf life. The FSS-BioGuard™ product line is typically used in parallel with the FSS-ProGuard Green™ treatment program. This secondary product is used in systems that have heavy fouling that is typically witnessed in MIC infested fire sprinkler systems.

D2 fire sprinkler treatment system