Promotes healthy growth of aquatic plants. Encourages lush, green growth. Special chelated formula for quick absorption through plant leaves. One ounce treats 60 u. s. gallons of aquarium water. Supplies Iron And Potassium. Iron Is Quickly Lost, Resulting In Yellow Leaves And Poor Growth. Potassium Is Needed For Photosynthesis. Contains 3.0 Percent Soluble Potash And 0.10 Percent Iron. 16 OUNCES