Kent Marine Iron and Manganese Plant Supplement supplements iron, manganese, potassium and other micronutrients to spur saltwater macro-algae and freshwater plant growth. Does not contain added phosphates or nitrates that cause undesirable algae growth. The iron and manganese used is chelated so that it stays in solution longer to provide lasting nutrient benefits to macro-algae, corals and freshwa ter plants . Ke nt Marine was established by aquatic hobbyists who saw a need for products that aid the user in creating the most natural enclosed marine and freshwater environment possible. From vitamin and mineral supplements to nutritional products and filter media, Kent aquarium set the benchmark and was one of the first in the aquatic industry to provide these unique solutions. For the past 15-year, Kent Marine products have helped aquarists create healthy aquariums. Through continuous research, testing and development, new products like salt mix, scrapers and Kent RO filters were brought into the Kent Marine family.