Won't harm pets. Details on back. Outperforms. All major bowl cleaners! Stops rush with every flush. Safe for plumbing & septic systems! No other toilet bowl cleaner works like Rustguard! Its unique formula is specifically designed to prevent rush and hard water stains - with every flush! Outperforms all major bowl cleaners! Safe for plumbing and septic systems. Won't harm pets. Safe for use in white and colored toilets. www.whink.com. Comments, Questions: Call weekdays 9-4 cst toll-free 1-800-247-5102. www.whink.com. Special offer free coupons. To receive coupons, provide Whink with your name, mailing address and phone number (limit one per household). Phone: 1-800-247-5102 ext. 257. Made in the U.S.A. Proudly Made in the U.S.A.