Chemi-pure Blue is specially created for fantastic results in reef and marine aquariums. The new proprietary blend of premium, low-dust palletized carbon, and high capacity ion-exchange resins are skillfully combined to create a superior all-in-one filter media in a nylon bag. Chemi-pure Blue significantly reduces organic compounds and phosphates while raising redox and helping stabilize pH for a healthy, crystal clear aquarium. Change every month depending on bioload. Removes dissolved organics Helps fish have a better appetite. Eliminates osmotic shock Increases fish lifespan. Filters out coppers, metals, odors, and phenol. Prevents ion antagonism.