Contains no phosphorus. Safe on metal & plastic pipes. Clears total blockages guaranteed! or it's free (Visit www.drano.com for details). www.scjohnson.com. www.drano.com. Questions? Comments? Call 800-558-5252 or write Helen Johnson. Learn more at: www.scjohnson.com. Environmental Facts: Please recycle. Made with over 30% renewable and sustainable energy.