Yes, Mr. Khalidullin the implementation of gray water treatment/supply systems in the communal services of all countries of the world would make a qualitative change in the use of  water and a change in the environment. It would not eliminate sewer in urban areas, but allow the centralized wastewater plant to focus only on black water. This would optimize resources of these urban areas.

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Yes, Mr. Khalidullin the implementation of gray water treatment/supply systems in the communal services of all countries of the world would make a qualitative change in the use of  water and a change in the environment. It would not eliminate sewer in urban areas, but allow the centralized wastewater plant to focus only on black water. This would optimize resources of these urban areas.