filter cycle

例句：

1. 1.The filter cycle in the water treatment plant is critical to maintaining clean water.
   水处理厂的过滤周期对保持清洁水至关重要。
2. 2.During the filter cycle, the water flows through a series of filters to remove impurities.
   在过滤周期中，水流过一系列过滤器以去除杂质。
3. 3. The filter cycle helps to maintain the quality of the water supply for the city's residents.
   过滤周期有助于维持城市居民用水的质量。