The water sample was collected from major five banks of river Ganga in Kanpur. The various physio-chemical parameters was applied to test the quality of water. It was found that the water quality was unpotable and not fit for daily uses. The seeds of Moringa oleifera was collected from Mangla Vihar area of Kanpur. The seed was shade-dried and extract was prepared with petroleum ether. The 10 ml of the extract was used to treat 1000 ml of sample water and the result was amazing. The extract was able to bind with individual particle of contaminants within 72 hrs. forming ‘floc’. The bacteria and virus were enmeshed with flor in seven days. The water in 7 days became as clear as fresh water. This is cheap, edible indigenous natural product for water dissipation.