CrystalClear Thrive slow release tablets will feed potted aquatic plants all season long, keeping them vigorous and beautiful. Simply use one tablet for every gallon of soil each month during the growing season. Push one tablet one finger deep into the soil, 3" from the crown of the plant. Press soil around the inserted tablet for best results. It is always a good idea to feed plants every two weeks when the water temperature rises above 75F. Ingredients: Guaranteed Analysis: Total Nitrogen (N) 0.0%, Boron (B) 0.02%, Ammoniacal Nitrogen 5.5%, Soluble Copper (Cu) 0.05%, Nitrate Nitrogen 2.4%, Soluble Iron (Fe) 0.11%, Water Insoluble Nitrogen 1.5%, Soluble Manganese 0.12%, Urea Nitrogen 0.6%, Molybdenum(Mo) 0.0006%, Available Phosphate (P2O5) 14.0%, Soluble Zinc (Zn) 0.07%, Soluble Potash (K2O) 8.0%, Derived from Ammonium Phosphate, Potassium Nitrate, Urea Formaldehyde, Manganese Sulfate, Iron Sulfate, Zinc Sulfate, Copper Sulfate, Boric Acid and Sodium Molybdenum.