These micro organism may be the cause of many serious diseases, So one of the most important thing to ensure is that , the water we drink is clean. The number of diseases are increasing as compared to olden days. The main reason for these disease are the un clean drinking and food habits. The water which we use for drinking and aquaguard cooking should be free from all diseases causing micro organisms. One of the practical method which we can employ to ensure the purity of water is by using a water purifier.