Nontoxic coolant that fights corrosion.A nontoxic, virgin propylene glycol formula for superior engine protection during storage or operation. Inhibitors protect against corrosion and additives help prevent breakdown at high temperatures. Biodegrades rapidly. We do not recommend usage at full strength in engine systems. Not for use in potable water systems.Key FeaturesNontoxic propylene glycol for year-round freeze and boil over protection50/50 mix protects against freeze to -34F and boil over to 260F; Gallon or 55 GallonsNon-toxic formula quickly biodegradesEnvironmentally friendly formula biodegrades rapidlyUse as a coolant in the summer and as antifreeze in the winter96% propylene glycol may be diluted to the solution you wishSpecial additives guard against slime and scaleNoteNot recommended for use full strength in engine systemsNot recommended for use in potable water systems