21. A pyrolysis method which produces activated carbon and high-grade carbon black has been suggested. 22. The facility produces in excess of 100 million pounds of granular activated carbon annually. 23. Coconut shells produce activated carbon with more micropores than does charcoal made from wood. 24. The simplest type of aquarium filter consists only of filter wool and activated carbon . 25. As such, it cannot be removed by activated carbon and travels easily through soils. 26. Since it is often not recycled, the mercury-laden activated carbon presents a disposal dilemma. 27. For the aquarist, replacing the activated carbon with fresh material is simple and inexpensive. 28. In 1965 the Calgon Corporation acquired Pittsburgh Activated Carbon . 29. Additional elements may be added such as activated carbon , zeolites, and materials that accumulate pollutants. 30. The remaining water is then processed through activated carbon and used to rehumidify treated soil.
