The city will take the lead in introducing rainwater collection and grey water treatment systems on a large scale, and use the treated water for wetland park water supply, greening, washing vehicles and toilets, as well as firefighting, air conditioning and other municipal miscellaneous uses. This will reduce pollutant emissions, reduce the impact on the water environment around the city, and increase the amount of reclaimed water available. This change is beneficial to environmental protection and the hydrological environment of the entire region.