Nontoxic, aqua blue color propylene glycol based anti-freeze for protecting heating, cooling, pool and potable water systems. FREEZE-FIGHTER is made from a renewable corn-based fluid that provides immediate green points. This bio-based anti-freeze is a great solution for those who need to earn points towards LEEDs Certification. It is specially formulated to provide HVAC systems with superior corrosion protection for most metals, including brass, cast aluminum, cast iron, copper, solder, and steel. It offers excellent thermo-physical properties all while protecting your system from corrosion and degradation for years. Recommended for Hydronic Systems that demand an environmentally friendly product. Excellent for Radiant Tubing, Closed Loop Solar Piping, Boilers, and Potable Water Lines. Deionized water is recommended for diluting FREEZE-FIGHTER.