Why was the traditional way of water supply not good before? What are the disadvantages?

The water supply of Sichuan Bohai Sea was introduced in official website. There are undoubtedly several traditional water supply methods: pneumatic water supply, water tower water supply and water tank water supply. These water supply methods are called traditional, and there must be some shortcomings. For example, the pressure of water supply is poor, so it is difficult to ensure the smooth normal water supply, and the water supply mode of water tank and water tower is also prone to water pollution problems.

In addition, using these water supplies will consume more resources and water and electricity. It is best not to have negative pressure water supply equipment.