Camco 30054 Pool Antifreeze Concentrate, 1-Quart One bottle can be diluted to your desired strength Designed for use with swimming pool plumbing systems Safe for copper, brass and all types of plastic except acetate Burst protection between -100F to 0F when diluted as directed. GRAS, non-toxic, non-hazardous, 100% biodegradable, safe with pets and kids