API Pond Pond Salt provides essential electrolytes fish need to survive with an all-natural salt, made from evaporated sea water. Improves gill function, protects against nitrite toxicity and reduces stress. Provides electrolytesImproves gill functionProtects against nitrite toxicity and reduces stressHelps to maintain a natural balance of electrolytes in the body fluids of pond fish. Can safely be used with all API Pond water conditioners, filtration materials, medications and fish foods. Monitor salt levels with a salt level test kit. Dosage may be doubled for ponds without plants for healthier fish. Made from all natural sea salt, Pond Salt replaces electrolytes essential for the uptake of oxygen and release of carbon dioxide and ammonium. It temporarily blocks the toxic effects of nitrate and is safe and non-toxic to all pond fish. Dosage: 4. 4 lbs treats 550 gallons 9. 6 lbs treats 1,200 gallonsNote: Formerly known as PondCare Pond Salt.