What Water Filters Remove Microplastics? | Types That Work

What water filters remove microplastics depends entirely on pore size, not brand names or marketing claims. A standard activated-carbon pitcher does almost nothing to plastic particles — they slip right through. Reverse osmosis (RO) systems and membrane filters with sub-micron pores actually block them, and a growing body of research confirms which designs deliver and which do not. Here is what the evidence says about each type.

How Microplastic Filters Actually Work

The critical specification is pore size. Microplastics range from roughly 1 micron down to nanoparticle sizes, and a filter must have pores smaller than the particles it intends to catch. Reverse osmosis membranes have pores around 0.0001 microns and capture 99 percent or more of microplastics, including nanoplastics. Sub-micron membrane filters with pores of 1 micron or smaller have shown 78 to 100 percent removal in peer-reviewed studies, with the best results at 0.2 microns or below.

Look for certification under NSF/ANSI 401, which covers emerging contaminants including microplastics. A product page that claims “removes microplastics” without a named certification, a stated pore size, or an independent test result is not trustworthy.

The Two Filter Types That Remove Microplastics

Only two classes of home water filters have proven effective against microplastic particles in independent testing: reverse osmosis systems and membrane-based filters with sub-micron pore ratings. The table below compares their key trade-offs.

For readers ready to choose a specific system, our tested roundup of the best eco-friendly water filters for reducing plastic waste covers the top-performing models and their real-world setup requirements.

Reverse osmosis delivers the highest removal rate, but it requires dedicated under-sink space, careful installation, and produces several gallons of wastewater for each gallon filtered. Sub-micron membrane filters offer a strong middle ground: simpler to install, less water waste, and still high removal rates when the pore size is 0.5 microns or lower.

Filters That Won’t Remove Microplastics

Several common water-treatment methods do not remove microplastic particles at all:

• Standard activated-carbon pitchers and faucet filters. Designed for taste and chlorine, not particle filtration.
• UV sterilizers.
• Boiling. Does not remove microplastics and may concentrate them as water evaporates.

Common mistakes include assuming any carbon filter removes microplastics, confusing taste improvement with particle removal, and buying a product that mentions “microplastic” in its marketing without a verifiable pore size or certification. Always check the micron rating and look for NSF/ANSI 401 certification before purchasing.

FAQs

Do Brita or Pur pitchers remove microplastics?

Standard Brita and Pur pitcher filters use activated carbon and ion-exchange resins that target taste, lead, and chlorine. They are not designed or certified for microplastic removal, and independent testing confirms they are not reliably effective against plastic particles.

Is bottled water safer from microplastics than tap?

Studies have found microplastics in bottled water as well as tap water, and bottled water is not regulated for microplastic content. A home filter verified for microplastic removal is a more consistent solution than switching to bottled water.

How much does a microplastic-removing filter cost?

Under-sink reverse osmosis systems typically range from $150 to $600 plus installation. Countertop sub-micron membrane filters range from $50 to $200 and require no installation. Check annual replacement-filter costs before choosing a system.