The Easy Reefer Easy E Calcium 1 liter is a high-quality calcium supplement designed to maintain optimal water parameters in saltwater reef aquariums. It provides essential elements including magnesium, strontium, barium, iron, manganese, vanadium, molybdenum, and trace metals crucial for the health of marine life and coral growth. This product is formulated with exacting precision to ensure that calcium levels remain between 405-440ppm, magnesium between 1230-1310ppm, and iron between 0.002-0.004ppm, creating an environment where delicate marine life thrives. It is recommended for lightly to heavily stocked reef tanks and can be easily dosed using the manufacturer's guidelines.