Point-of-Use Water Filters Show Varying Success in Removing Microplastics
By Jacey Sillito
Conventional water treatment plants remove most microplastics, but tiny synthetic fragments still reach tap water. Point-of-use home filters provide an effective secondary barrier, though their success depends entirely on the specific filtration technology used.
The National Library of Medicine has published a study evaluating consumer POU devices for microplastic removal: https://www.mdpi.com/2073-4441/15/6/1118
Researchers tested three common pitcher filters—combining carbon, ion exchange, and fine membranes—against plastic particles and fibers in tap water.
Filters equipped with fine physical membranes caught 78% to 100% of plastic fragments, with the tightest membranes (0.2 micrometers) performing best. In contrast, standard pitcher filters using only basic carbon and ion exchange failed to reliably trap small fragments, sometimes even releasing previously trapped particles back into the filtered water. Long synthetic fibers were much easier for all filter types to catch than tiny, jagged plastic fragments.