Rates of liquid phase adsorption in fixed-bed packed with active carbon pellets are discussed for the concentration of aqueous fuchsine solution, for its flow rates, and for the height of adsorption column. In order to determine the kinetics of adsorption, material balance is applied to experimental data obtained from concentration-time profiles of the solution passing through the fixed bed of adsorbent. It is confirmed that external mass transfer model might hold for the mechanism of the adsorption of aqueous fuchsine solution on the pellet active carbon in the fixed bed, assuming that the flow pattern is a plug flow and the diffusion in the axial and radial direction of the column is infinite and negligible, respectively.