filter does just that filters out organic material/debris to a certain micron size that the filter in made for
purifier does just that it purifies the water either chemically (chlorine injection) or with a UV light it will kill the beasties in the water that can be harmful to humans.
filters are generally at either end of the purifying process one at the first stage to remove larger materials then the purifier and then a more finer filter to remove the finer particles
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