Twice as strong as the leading brand! Manufacturer's money back guarantee (see details on back panel). Great for removing rust & hard water stains all around the house. Laundry. Kitchen. Siding. Brick. Bathroom. Appliances. Concrete. Boats & RV's. Money Back Guarantee: If product performance is not satisfactory, return unused portion to Whink Products Co. with receipt for a full refund. Safe on septics. Product settles. Sold by weight not volume. Comments, questions: Call weekdays 9-4 CST toll-free 1-800-247-5102. www.whink.com. Proudly made in the USA. Made in the USA.