Specifically formulated to clean and condition steam and hot water boilers and hydroid heating systems. Contains silicone which protects pumps by lubricating seals; frees and lubricates zone valves. Prevents clogging of hot water valves and other flow valves and helps stop priming and foaming with a special anti-foam agent. Safe and simple to use. Promotes maximum boiler efficiency and saves fuel. Removes oil, sludge, loose rust and scale and prevents corrosion. No draining or flushing is necessary unless system is very oily, rusty, or in unusually dirty condition. Safe for use in systems with rubber and plastic components. Compatible with any type of Hercules Cryo-tek anti-freeze, other propylene glycol based anti-freeze products and commonly used chemical additives and boiler treatment compounds.