noun, noun or participle which takes 'suru'
self-purification; self-cleansing
Used for natural or automatic purification, such as a river cleaning itself or a system removing impurities without external help.
この川は自浄作用が高い。
This river has a high self-purification capacity.
湖の水質は自浄によって保たれている
The lake's water quality is maintained through self-purification.