The 10% Zncl2 impregnated GAC is more effective in adsorption of physical and biological pollutants while 20% adsorbed more of the chemical pollutants. The GAC from Nigerian bamboo can reduce microbiological pollution, heavy metals and anions to tolerance limits which other forms of activated carbon such as palm kernel shells and coconut shells cannot reduce. It can absorb pollutants continuously for 72 hours with maximum efficiencies within the first 24 hours.