API Pond Salt 9.6 lbsA lack of electrolytes in pond may cause serious health problems for fish. API POND SALT supplies electrolytes to improve fish respiration. Made from evaporated sea water and containing natural active ingredients such as a natural fish tonic, API POND SALT promotes the overall health of your fish by improving their gill function and reducing stress in a pond. This all natural salt provides the essential electrolytes fish need for the uptake of oxygen