If only want to remove sand, rust, without considering removing encrustation, bacteria can use water purification devices.
如果只是想去除泥沙，铁锈，而不考虑去除水垢，细菌，可以用净水器。
Methods Field experimental observation on purification efficacy of electronic air cleaner on particle and natural bacteria in the air was made.
方法采用现场实验观察电子空气净化机对可吸入颗粒、空气中自然菌的净化效果。
C. Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.
传统的废水净化系统在低温下并不能完全成功地杀灭细菌。
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