Dissolves. Contains concentrated lye. Safe for all pipes. Guaranteed to work on the toughest clogs. 800-613-4242. 100% satisfaction money-back guarantee! If not completely satisfied, mail or email your name and address and the store receipt, along with a brief description, for a full refund of your purchase price. Allow 4 weeks for delivery and please try us again in the future. Guaranteed to work or it's free! www.scotchcorp.com. The instant power help line 800-613-4242 (9-5 CST, Mon-Fri). Made in USA.