The activated carbon base shall be coconut shell based with a carbon tetrachloride activity of no less than 60% and a retentivity of no less than 35%. The hardness shall be no less than 95% with an ash content of no more than 5%. The moisture content of the base carbon shall not exceed 2%. The particle size distribution shall be a nominal 4 x 8 mesh. The bulk density of the base activated carbon shall be between 29-31 pounds per cubic foot.