TEMP ZONE-RED is a powerful rust and corrosion inhibitor that keeps your car's cooling system working cool and clean under most conditions. TEMP ZONE RED is formulated to be used in Extended Life Cooling Systems. This special formula contains water that has been chemically treated to be free of iron, chlorine, lime, magnesium and scale deposits; which are known to be the major cause of cooling system breakdowns. TEMP ZONE RED purpose is to eliminate the mixing of antifreeze with the impurities of water and to prevent the deposits that may clog the system which may lead to cooling system failure. For use in tropical environments only.