Not sure of which Chemi Pure to purchase? Get the Variety Pack. It includes:

Boyd Enterprises Chemi-Pure, 10 oz
Boyd Enterprises Chemi-Pure can be used with all water types as a chemical absorption filter and ion generator and exchange unit to positively keep pH at a perfect constant level. Also fantastic for use with African Cichlids and Discus! 10 oz. Treats 50 gallons. Replace every three months. Pre-packaged in a nylon filter bag.

Boyd Enterprises Chemi-Pure Blue, 11 oz
Boyd Enterprises Chemi-Pure Blue, 11 oz, is specially created for fantastic results in reef and marine aquariums. This new proprietary blend of premium, low-dust pelleted 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. 10 oz. Treats 75 gallons. Replace every four months. Pre-packaged in a nylon filter bag.

Boyd Enterprises Chemi-Pure Elite, 11.74 oz
Boyd Enterprises Chemi-Pure Elite can be used with all water types as a chemical absorption filter and ion generator and exchange unit to positively keep pH at a perfect constant level. Also fantastic for use with African Cichlids and Discus! Chemi-pure Elite formula now contains ferric oxide, that helps remove slime and PO4 (phosphates), giving your coral and fish a healthy environment to grow and live. 11.74 oz. Treats 50 gallons. Replace every three months. Pre-packaged in a nylon filter bag.

We also include in this package a FREE MarineAndReef.com Aquarium Cleaning Towel. The MarineAndReef.com Aquarium Cleaning Towel is a durable, lint-free microfiber towel. 19" X 15".