Granular activated carbon is made from raw organic material like coconut shells that are high in carbon. Heat in the absence of oxygen is used to activate the surface area of the carbon. The raw material is placed in a tank without oxygen and subjecting it to extremely high temperature of around 900 degrees Celsius. Afterwards the carbon is exposed to chemicals such as Argon and Nitrogen following which it is again placed in the tank and super heated to a temperature of 600 to 1200 degrees Celsius. Activated carbon so obtained is further crushed and sieved to obtain in granular form.