The ProTech 300 Outdoor Wood Boiler Water Treatment and Rust Inhibitor offers 3 levels of protection! ProTech 300 Has been designed to be used in Manufacturers boiler treatment programs. These programs insist the boiler owner meet certain nitrite levels in order to comply with warranty requirements in regards to boiler corrosion protection. Adding 1 gallon of ProTech 300 to 300 gallons of boiler fill water will yield +/- 1000 ppm nitrite. Suggested nitrite levels are: 750ppm = Adequate, 1000 ppm = Good, 1500 ppm = Great. Dose system accordingly on required control levels set by your boiler manufacturer and your system’s nitrite need based on test results. The manufacturers can’t tell the difference if you're using their expensive brand or our ProTech 300, so send it into their labs to be tested without worry. The ProTech 300 Outdoor Wood Boiler Water Treatment and Rust Inhibitor works on all Outdoor Wood Boilers and Furnaces. ProTech 300 Outdoor Wood Boiler Water Treatment and Rust Inhibitor can treat up to 500 gallons of water based on water conditions*. *Best to increase dosage if... - Fill water is high in iron - Fill water pH is low - System temp is maintained above 160 degree F - Frequent water additions due to evaporative loss - Fill water has high dissolved solids - Unsure of your system volume Recommended treating up to 300 gallons if the above apply. If the above does not apply, one gallon of ProTech 300 will treat up to 500 gallons of water. ProTech 300 Outdoor Wood Boiler Water Treatment and Rust Inhibitor is commonly used on Central Boiler, Aquatherm, WoodMaster, Cozeburn, Empyre, Freedom, Hardy, Hawken, Heatmaster, Heatmor, Natures Comfort, Ozark, Polar, Sequoyah, Shaver, Taylor, Wood Doctor, Mahoning, and Aspen. ProTech 300 Outdoor Wood Boiler Water Treatment and Rust Inhibitor is also used in Steam Boilers, Hot water systems and closed loop as well as pressurized systems as well. Indoor, outdoor and outside boilers and furnaces are fine as w