Making chitosan coating active charcoal is similar to that done by Nomanbhay and Palanisamy (2005). Fifteen gram active charcoal was entered into 15 ml gel chitosan 1% (1g chitosan in 100 ml oxalate acid 10%) and the mix was shaken with shaker for 24 hours. Ratio of 15 ml gel chitosan 1% and 15 g active charcoal is considered 1:1 that coded with K1A1. The mixture was filtered, washed with distilled water and dried. coating process was repeated three times to obtain thick chitosan on active charcoal.