filter
fil-ter
noun
A device or material used to remove unwanted particles from a fluid or gas.
"The car's air filter needs changing."
verb
To pass a substance through a filter to remove impurities or unwanted elements.
"You must filter the water before drinking."
Thesaurus
Synonyms: trickle, dribble, filter out, filtrate, separate out, strain, percolate, permeate, sink in