Water was tested after purification with methods like chlorination, iodination, boiling, cloth filtration, candle filtration, polyethylene membrane filtration, treatment with alum, treatment with activated carbon and treatment with ultra violet rays. Water was tested by using two microbiological methods namely Multiple tube Test and Membrane Filtration method. Of the methods of purification used chlorination, iodination, boiling, treatment with ultra violet and treatment with activated carbon disinfect water to make it potable. Methods like treatment with alum, candle filtration and cloth filtration reduce the bacterial content of the water but do not make the water potable. Of the methods which disinfect water to potable levels the cost effective method among those found to disinfect is chlorination. Membrane Filtration method is more sensitive than Multiple Tube Test for bacteriological assessment of water.
