Kopertox® 16 oz(Copper Naphthenate). Aids in treating horses and ponies with thrush. Water resistant protection without bandaging. This topical hoof care solution aids in the treatment of thrush in horses. Formulated to kill the organisms that cause thrush. To use, simply apply to the affected hooves daily with a paintbrush (sold separately). Creates water resistant protection with no need for bandaging. Kopertox is great to keep on hand in any barn or stable.