我需要为我的咖啡机买一个新的过滤器。

I need to buy a new ___filter for my coffee machine.

工厂必须安装特殊的过滤器以减少空气污染。

Factories must install special ___filters to reduce air pollution.

水族箱的水过滤器需要每月清洗。

The aquarium's water ___filter needs cleaning every month.