Pura Complete is a professional strength full spectrum chemical filtration media.Pura Complete is a blended media that provides the most complete aquarium pollutant control at a very low cost. Blended with 25% PhosLock for total phosphate and silicate control, virgin bituminous acid washed carbon, and cation exchangers which controls ammonia and heavy metals. Pura Complete will remove a broad range of organics from aquarium water like urine, phenols, coloring agents, odors, and proteins as well as a broad range of heavy metals like copper, lead, and mercury that accumulates over time from trace quantities found in all fish foods; a broad range of toxins like ammonia, formaldehyde and arsenic; and a broad range of aquarium scum promoters like phosphates, and silicates.Pura Complete is fast acting, long lasting and very effective in reef, marine, planted,and delicate freshwater aquaria. The 32 oz will treat a 200-gallon tank up to 6 months. Place Pura Complete in a fine meshed bag instead of plain carbon,and no additional "specialty media" is needed to provide total, complete,and cost effective aquarium waste management.