PFAS and microplastics are often discussed together, but they are different groups of contaminants and require separate decisions. Before buying treatment equipment, find out what has actually been measured in your water and compare the documented performance of the specific device you are considering.
What are PFAS?
Per- and polyfluoroalkyl substances (PFAS) are a large family of synthetic chemicals. PFOS and PFOA are two well-known members of that family. Because many PFAS persist in the environment, they can be found in water, food, air, dust and consumer products.
Health Canada says the potential health risk depends on which PFAS a person encounters, the amount and duration of exposure, and individual factors. If you are concerned about drinking water, contact your municipality, drinking-water authority or public-health authority for local information.
What are microplastics?
Microplastics are plastic particles smaller than 5 mm, according to the U.S. National Ocean Service. Their size, shape and composition vary, so a general claim about “microplastic removal” does not establish how a particular filter performs. Ask for a performance data sheet that identifies the test method and particle-size range.
Start with information about your water
- For municipal water, review your utility's water-quality report and ask whether PFAS testing results are available.
- For a private well, use an accredited laboratory and choose tests based on local land use and public-health advice.
- Boiling does not remove PFAS and can concentrate substances that remain after water evaporates.
How PFAS treatment options differ
Health Canada and the U.S. EPA identify activated carbon and point-of-use reverse osmosis as technologies that can reduce certain PFAS when the device is designed, tested and maintained for that purpose. Ion-exchange media designed for PFAS may also be effective, although Health Canada notes that there are currently no certified residential ion-exchange systems for PFAS removal.
Technology category alone is not proof that a particular product will reduce PFAS. Look for a certification for PFAS reduction under NSF/ANSI 53 for activated carbon or NSF/ANSI 58 for reverse osmosis, then verify the exact model in the certification body's latest directory. EPA noted in April 2024 that certifications focused on specific PFAS such as PFOA and PFOS and did not yet demonstrate reduction to EPA's then-new drinking-water limits; check current certification information before choosing a device.
Maintenance matters. Media capacity, incoming concentration, water chemistry and replacement intervals affect performance. Follow the manufacturer's schedule and ask your local authority how used media should be disposed of.
Point-of-use or whole-home treatment?
Health Canada recommends reverse osmosis at the tap because RO water installed upstream may corrode plumbing and cause contaminants such as lead to leach into the treated water. PFAS exposure through bathing, showering, dishwashing and laundry is unlikely to contribute significantly to health risk, so treating drinking and cooking water at one tap may be the more appropriate starting point. A whole-home PFAS approach, when justified by testing, should use verified activated carbon or PFAS-specific resin designed for the required flow and should not be treated as whole-home RO.
Questions to ask before choosing a filter
- Which contaminant and concentration are you trying to reduce?
- Is this exact model independently certified for that claim?
- What capacity and replacement interval apply to your water conditions?
- What installation, drain, pressure and space requirements apply?
- What do replacement filters cost, and how will you know when to change them?
Water Doctor can help interpret your treatment goal and installation constraints. Ask for the certification and performance data for the exact model before relying on any contaminant-reduction claim.