potassium filter

例句：

1. 1. The potassium filter isused to remove impurities from waterbefore it is consumed.
   钾过滤器用于在饮用前去除水中的杂质。
2. 2. The potassium filter is an essential part of thewater treatment process.
   钾过滤器是水处理过程的一个必要部分。
3. 3. The potassium filter isdesigned to prevent contaminants fromentering the drinking water supply.
   钾过滤器设计用来防止污染物进入饮用水供应。