Dissolves rust & hard water build-up. New. Thick, powerful, fast acting formula! Bathroom. Kitchen. Outdoor & more! Lime Out Heavy-Duty Rust, Lime & Calcium Stain Remover easily dissolves tough hard water and rust stains. Made by the makers of Iron Out heavy-duty rust removal experts, it is specially formulated to remove all three types of stains caused by hard water. The concentrated formula works fast and is safe to use for a variety of applications both indoor and outdoor. For helpful tips, periodic offers and information on the family of out products visit: www.summitbrands.com. Performance Guaranteed: If not satisfied with product performance mail register receipt along with UPC to Summit Brands for a full refund. 1-888-476-6688 Mon - Fri 8-5 EST. wwww.summitbrands.com. Contains no phosphates. Safe for septic tanks. Made in the USA.