Ferrous Gluconate 8 oz.

8 oz. food grade ferrous gluconate.
100% ferrous gluconate dihydrate
Mix 1/8 cup (20 g) ferrous gluconate in 1 cup water (250 ml) water to make 10,000 ppm solution. Add 1/8 teaspoon (0.625 ml) of this stock solution to 12.5 gallons (47.3 L) water for an initial concentration of 0.26 ppm. Periodically add stock solution at this dosage or as required to maintain about 0.10 ppm iron in solution. Mix and dose iron compounds separately from other fertilizers to avoid tank cloudiness. Adding a small amount (3-5 ml) of vinegar to the solution will help with bioavailability.