Do water filters remove microplastics?
Some tested devices reduce particular microplastics. In one laboratory study, membrane-containing devices outperformed a granular-carbon/ion-exchange device for added PET and PVC fragments. The study tested two units of each type and did not assess particles below its 10-micrometre collection threshold. It cannot establish nanoplastic removal or rank today's retail models. Read the study and methods.
Our buying rule: look for evidence about the complete model, the particles tested, and performance across cartridge life. A pore-size number alone is not a complete product test.
Before you buy anything
Find your utility's water-quality report, or consider appropriate testing if you have a private well. Choose the contaminants you want to address before choosing the equipment. This is also NSF's recommended starting point. Check an existing filter's model and cartridge before replacing the whole system.
During an advisory, follow your water authority's instructions. For infant feeding, use current preparation guidance; this buying guide does not replace it.
Read the claim, not just the badge
- Match the model and replacement cartridge. Use the certifier's public database, rather than assuming a whole brand is covered.
- Find the specific reduction claim. NSF's database includes “Microplastics Reduction.” A standard number on its own is not proof of every claim available under that standard.
- Read the performance sheet. Record capacity, operating conditions, replacement requirements, and the scope of testing. Ask for the report behind a nanoplastics claim.
- Keep the evidence with the purchase. Save the listing and instructions for the exact combination you intend to use.
NSF explains that certification does not cover every contaminant. A third-party test report and an active product certification are different records; read what each actually covers.