What is Gray Water water from homes or offices is called grey water unless it is contaminated by a sewer. Sources of gray water include washing machines, dishwashers, showers, bathtubs, sinks. Gray water is usually clear or slightly gray in color and contains organic substances such as detergents, shampoos, soaps, toothpaste, hair and skin oils. These substances are the main source of suspended solids and phosphorus in gray water. Gray water is less polluting than black water (toilet water) and can be treated and reused. Why Gray Water Treatment System is Important Gray water has a much lower organic load than sewage, so it can be treated and put to good use. Gray water should not be stored for more than 24 hours. If gray water is stored for too long, the water will start to deteriorate and an unpleasant odor will appear in the water. Therefore, bacteria, germs and other microorganisms that can cause many diseases will multiply in the water. It is necessary to use treatment systems to recover this water. Gray water treatment systems are widely used in homes, offices, hotels and industrial plants.Advantages of Using Gray Water Treatment System The primary benefit of using a gray water treatment system is reduced water usage.