Check the listing for details. CrystalClear Polish AC - Activated Carbon. Condition: New. Listed at 59.99 USD. CrystalClear® Polish AC™ is bituminous coal that has been exposed to extreme heat which activates the carbon giving it powerful absorbing powers. The billions of pores within the carbon act as hundreds of sponges soaking in many pond pollutants such as tannins, ammonia, nitrite and nitrate. The result is a polished, healthy pond environment. - Removes Tannins, Chlorine & Odor- Polishes Water & Removes Microscopic Debris- Removes Ammonia, Nitrite & Nitrate- Includes (1) Mesh Application Bag Routine Application Rate Remove mesh bag provided from bucket and fill with the appropriate amount of carbon for your pond size or filter size. Rinse the filled mesh bag thoroughly to remove any carbon dust accumulation. Then apply to filtration unit. It is always best to use Polish AC™ in conjunction with a filter. It is not recommended to use Polish AC™ by itself within the pond. Replace bag with new Polish AC™ carbon every 3 months. It is important to maintain fresh activated carbon especially throughout the spring and summer season when pond pollutants are at their highest levels. Persistent Problem Application Rate For large fish loads it is advisable to double the amount of carbon for the pond size. For Best Results Make sure to rinse Polish AC™ thoroughly before placing in filter. Never wash carbon after it has been in the pond with tap water. If carbon is washed vigorously dunk the bag in water with no chlorine present. Product Notices Polish AC™ can be disposed of with normal waste service. Item #SizeTreatsCC090-55 lbs2,000 gallons up to 3 monthsCC090-1515 lbs6,000 gallons up to 3 months