Watch CFS (Clean Flush Soak) Descaler in action as it descales this heat exchanger. CFS Descaler is a corrosion inhibited, safe, bio-degradable, calcium, lime, rust, mineral and marine growth descaling agent. Suitable for use as a safe fast and effective alternative to mechanical cleaning of equipment where scaling is and issue. For use in Engines, fresh and seawater cooling systems, strainers, all heat exchangers, water makers, pumps, piping, parts and anywhere requiring mineral, rust or lime descaling.