You've asked for it, now you've got it. The fish farmers "Trade Secret" for ridding all anchor worm, fish lice and most flukes. Now available for the hobbiest for koi and goldfish pond treatment. This listing is for ONE 8oz bottle One teaspoon treats 500 us gallons - must shake well active ingredient is diflubenzuron and one 8 oz bottle treats 25,000 us gallons Dimillin-Compound Best Known Effective Treatment for Argulus (Fish Lice), Lernaea (Anchor Worm), Ergasilus (gill maggots), Flukes and other Copepod crustacean parasites. Non toxic to fish, plants or biofilter even at 10x reccomended dosage Insect gyrase stops cruacean molting, endsing life cycle of parasites you can see such as anchor worm and Fish Lice. Mixed with surfactant providing efficient dispersion and absorption for practical pond treatment applications Shake bottle vigorously for 30 seconds prior to dosing