Boyd Enterprises Chemi Pure EliteBoyd Chemi Pure Elite features the same powerful filtration media as original Chemi Pure, but with added ferric oxide to remove phosphates, silicates and red slime (cyano bacteria) for cleaner, clearer water. It also supports aerobic bacteria growth and removes dissolved organics in all aquarium types. Superior filter media in durable nylon bag Now with ferric oxide to remove phosphates and silicates For freshwater, marine and reef aquariums Chemi