Blasts calcium/dissolves lime/zaps rust stains. 80% plant-based ingredients. Septic safe. Money Back Guarantee: CLR Calcium, Lime & Rust Remover is guaranteed to perform to your complete satisfaction or return to place of purchase with receipt for a full refund of purchase price. Safer Choice: Meets US EPA Safer Product Standards. epa.gov/safechoice. clrbrands.com. More uses, tips & instructions at clrbrands.com. Women owned. This bottle is 25% or more post-consumer recycled plastic. USDA Certified Biobased Product: Product 80%. Encourage your local government to establish a recycling program. Made in USA.