SeaGel™is an efficient blend of MatrixCarbon™ and PhosGuard™. SeaGel™ removes organic and color impurities, phosphates, silicates, toxic metals and acids. Both components are bead shaped for optimum water flow characteristics. SeaGel™ is ideal for reef and marine aquarium use, particularly for algae control. It may also be used in freshwater that is not phosphate buffered. A 250 mL bottle will treat 40–60 gallons for 3 to 4 months. Marine or freshwater use.