Her filterlessness was evident in her blunt and honest remarks.

I need to buy some filterpapers for my experiment.

I need to buy some filter paper for my experiment.

The observatory has multiple filterwheels to switch between different filters.

I need to buy some filterpads for my fish tank.

I need to replace the filterpad in my air purifier.

I need to buy a filtercard for my air purifier.

I need to buy some filtercards for my coffee machine.

I need to buy some filtercubes for my aquarium.

The filterman repaired the air conditioning unit.