This antifreeze is formulated with 10-15% glycerol. Winterize your RVs, boats, spas, hot tubs, pools, vacation homes, and campers with EZ POOLS ethylene-free antifreeze made with a plant-derived additive for -50°F burst protection. EZ POOLS RV & Marine Antifreeze is specifically designed for use in RVs, vacation homes, boats/marine equipment, pools, spas, and more. This product does not contain ethylene glycol.