Water is the essential element for life. There is no life without water. Our inner instincts make us look for water in order to survive. Water is used for drinking, but also in the household in order to have a decent life and to do the laundry, the dishes, to take a shower, for cleaning the home and so on. Many people also use the water for cooking purposes. But in fact, even though we know how water is important, we hardly ever pay attention to cleaning the water tank where the water is stored. The tank water is used for everyday purposes such as for brushing the teeth or for showering, bathing, cleaning or mopping. This explains how important it is to have a clean tank. The tank water must be safe in order to avoid contamination with bacteria and avoid some illnesses that may be caused by those bacteria. As the time passes sediments scale and algae get deposited on the walls, ceiling and the floor of the water tank. This deposition contaminates the water and makes it unfit for use. The bacteria and algae grow and spread in the tank water and contaminate the water we use every day for different purposes. It means that if we use the contaminated water we may get sick eventually because of using it. The ignorance of the need of cleaning the water tank may be a health threat for the whole family. Some people decide to do the traditional cleaning of the water tank, but one cannot be sure if the tank was cleaned well. Hiring some professionals for this job is the solution for having some safe water from the water tank. In this modern era, many things have changed and also the techniques of cleaning the water tanks have changed and have become more modern, sophisticated and effective. There are 5 stages in the water tank cleaning process that make the process effective.