理化指标变化小，不易受环境污染，水温变化小，深水源一般无需处理即能达到

The change of physical and chemical indicators is small, and it is not easy to be polluted by the environment. The change of water temperature is small. Deep water sources generally can meet the production and domestic water requirements without treatment. Simple water withdrawal, one-time investment cost is less, daily cost is less

The physical and chemical index changes small, not vulnerable to environmental pollution, water temperature change is small, deep water sources generally need not be treated to achieve production and domestic water requirements. Easy to fetch water, less cost of one investment, less daily expenses

The change of physical and chemical indexes is small, not easy to be polluted by the environment, and the change of water temperature is small. Generally, the deep water source can meet the requirements of production and living water without treatment. Simple water intake, less primary investment cost and less daily cost<br>