For this product we require a completed Drug & Chemical Affidavit on file. If you have not submitted this form to us, please click here, and fax (813-671-8237) or email (fishsupplies@verizon.net) back to us. Thank You. USE: For external parasites (Flukes and flatworms). Can be used in fresh or saltwater. Safe for use on sharks. This product is much safer than other anti-parasitic medications. DOSAGE: 1/4 teaspoon per 40 gallons of aquarium water. Dose 1 time and leave in the water for 5-7 days. This product must be mixed with ethyl alcohol (vodka) to become soluble in water before use. Info from National Fish