Chemi-Pure's original formula is the ultimate in simple and convenient chemical filtration to assist in maintaining clean, clear aquarium water. By combining premium pelletized carbon with specialized ion-exchange resins and placing these inside of a fine-mesh nylon media bag, Chemi-Pure delivers a convenient and effective way to rapidly remove organic compounds and improve water clarity in your aquarium. The premium-grade carbon and ion-exchange resins are able to reduce dissolved wastes, odors, phenols, toxins, and medications including copper. Another benefit of the reduction of dissolved organics in the water column is a natural increase in REDOX, allowing for more efficient breakdown of solid wastes in the aquarium. This will have a positive effect on coral and fish health, assist in maintaining system stability, and improve the overall appearance of your aquarium. Features Now featuring QuickWash Carbon, a pelletized activated carbon that has 30% more surface area than their original carbon Carbon structure is harder and cleaner, reducing the potential of HLLE developing in your fish due to fine carbon dust particles Keeps aquariums crystal clear Removes dissolved organics Filters out coppers, metals, odors and phenol Three Sizes Available: 5oz (Treats up to 25 gallons) 10oz (Treats up to 50 gallons) 40oz (Treats up to 200 gallons) Directions: Keep Chemi-Pure sealed wet in container until ready for use. Rinse bag under running water for 5 to 10 seconds. Place bags into a high flow area of your sump, reactor, canister filter, or HOB filter. For best results, water should flow gently through the filter bag and media. Chemi-Pure should be replaced approximately every 2-4 months depending on bio-load. If more than one Chemi-Pure filter bag is used, change one at a time every week until all bags have been replaced. Type of Chemi Pure: Original Elite Blue Green Safe for what kind of tank? Freshwater or Saltwater aquariums Freshwater or Saltwater aquariums Higher pH aquariums which include: Saltwater reef tanks, Cichlids, Goldfish and Koi Freshwater planted aquariums What’s in it? Extruded Pelletizezd Carbon, Organic Scavenger Resin Extruded Pelletized Carbon, Organic Scavenger Resin, Granular Ferric Oxide Extruded Pelletized Carbon, Phosphate Absorption Resin, Organic Scavenger Resin Low dust pelletized activated carbon, organic scavenger resign to remove negative ions in the water column. Great For? Water clarity for aquariums with a light bio-load. Aquariums where phosphates and organics are not elevated beyond an acceptable level. Helps with odor. Helps with a yellow tint. Controlling phosphates over a long period of time. Ideal for aquariums with a medium bio-load or experiencing a mild bout with nuisance algae. Heavily bio-load aquariums and heavily stocked aquariums. Treats more water per ounce of media. Available in the nano packets. Reducing yellow tint, orders, toxins, organic compounds, and medications for planted aquariums.