For human health, particularly important to the quality of water consumed. The presence in water of some microorganisms - viruses, bacteria, microscopic algae and fungi can cause serious illness. One of the most important stages in the process of filtration (water treatment) is, of course, decontamination. Disinfection of water - is, above all, the removal of microorganisms from the water. All the main types of disinfection can be divided into physical and chemical. By chemical methods of disinfection of water-treated by different oxidants: chlorine, iodine, ozone and dob The physical methods of disinfection is boiling, disinfection with ultraviolet and ultrasound. Purification of water - an important point on which everyone should consider. No need to be an expert to understand that if the water is muddy, it needs cleaning. The cause of turbidity are suspended in the water impurities varying degrees of dispersion, occur as the smallest and coarse, fast settling particles. Some of the larger particles repel each other, as they have the same name by an electric charge, and therefore can not be enlarged and precipitate. An important step in water purification is the process of clarification of water, during which removed suspended impurities in water and, consequently, eliminates the turbidity. In the clarification of water, suspended impurities are removed, for example, the rate of water drinking-water purposes is usually not more than 1,5 g / liter. During the process of removing turbidity, suspended solids of various detention is due to their interaction with the grain loading. In the layer of filtering material fall and remain suspended particles, and the clarified water is removed from the filter. Typically, a load of grain for clarification of water use inert materials - gidroantratsit and quartz sand. Reagent water clarification - is the process of removing turbidity of the water by extracting small suspended solids, with the help of special substances and filtering. It is widely used in practice (usually in small water treatment systems) coagulation - a way to reduce the water content in the fine impurities. When coagulation in water consistently dosed oxidant, coagulant and flocculant, cause the beans to uploading the impurity of water coalesce, forming large flakes, which are easily filtered out. The second stage filtration - this is the final filtration of water. Granular load are usually inert materials - quartz sand and gidroantratsit. The final stage of purification is its decontamination. What kind of filtration system to choose - you decide, but do not forget about the problem of water purification.