Check the listing for details. CrystalClear Biological Clarifier - 300 pkts.. Condition: New. Listed at 399.99 USD. CrystalClear Biological Clarifier - 300 pkts. Part Number:CCB002-25 Description The Crystal Clear Biological Clarifier is made to naturally clear water, remove odors and breaks down suspended dead debris and decaying leaves. It comes with pre-measured water soluble packets that seeds and maintains biological filters and breaks down suspended dead debris. This is done using its natural bacteria and enzymes. Safe for all fish and water plants. Routine Application Rate Apply Biological Clarifier every 1-2 weeks Persistent Problem Application Rate If a problem arises between routine applications, apply Biological Clarifier at prescribed rate up to every 3 days until the problem is under control. For Best Results Apply Biological Clarifier directly into the filter if possible or apply directly to the pond in an area of the greatest circulation. Optimal Water conditions: pH: 6.5 " 8.5, Dissolved Oxygen: 5ppm, Temperature: 50 degrees.1 packet - Treats up to 1000 Gallons2 packet - Treats up to 2000 Gallons4 packet - Treats up to 4000 Gallons8 packet - Treats up to 8000 Gallons Additional Images