Bottom line: Most refrigerator water and ice filters are not certified for microplastic removal. Their activated-carbon cartridges typically operate at 0.5–20 micron pore sizes — fine enough to catch sediment and improve taste, but coarse enough that most microplastic fibers and fragments pass through.

Affiliate Disclosure: This article contains affiliate links to products we've researched and believe in. If you purchase through these links, we may earn a small commission at no extra cost to you. See our full disclosure for details.

What Fridge Filters Actually Do

  • Standard fridge filters (Samsung, LG, Whirlpool, GE) are certified to NSF/ANSI 42 (chlorine, taste, odor) and sometimes NSF/ANSI 53 (lead, cysts, mercury). They’re not certified to NSF/ANSI P473 (the microplastic standard).
  • Pore size matters. Most fridge cartridges use 0.5-micron carbon blocks at best. That blocks particles larger than 0.5μm but misses smaller microplastic fragments and the nanoplastic fraction entirely.
  • Class I particulate filters (the highest sediment-filter class) catch particles 0.5–1μm — better, but still well above the size range RO catches (~0.0001μm).
  • Flow rate is the trade-off. Fridge filters need to deliver ice and cold water on demand, so manufacturers prioritize flow over fine filtration. A true microplastic-grade filter is slower by design.

A global tap water study found 81% of samples contained microplastic fibers, most of them under 5mm and many well under 1μm. A standard fridge filter wasn’t built for this.

What major fridge brands actually filter

The four big US fridge brands all use carbon-block cartridges with NSF 42/53 certification — none currently market a microplastic-rated OEM filter.

Brand Common cartridge Pore size Microplastic certification
Samsung DA29-00020B ~0.5μm Class I particulate None
LG LT1000P / LT800P ~0.5μm None
Whirlpool / KitchenAid EveryDrop EDR1RXD1 ~1μm None
GE XWFE / RPWFE ~1μm None
Frigidaire PureSource Ultra II ~0.5μm None

Aftermarket “compatible” cartridges (Waterdrop, Glacier Fresh, etc.) generally match OEM specs and have the same limitation — they’re built to fit the fridge slot, not to catch sub-micron plastic particles.

The realistic fix

If you want microplastic-grade water from the fridge dispenser without replacing the appliance, the standard approach is an under-sink RO system tee’d into the cold-water line that feeds the fridge. That gives you RO-filtered water at the kitchen faucet and in the ice maker, without changing the fridge itself. A plumber’s job; ~1 hour install.

What You Can Do

  1. Plumb an under-sink RO system to your fridge. Most under-sink RO units like the Waterdrop G3P800 can be teed off to feed both the kitchen faucet and the fridge’s water/ice line. RO removes >99% of microplastics including nanoplastics.
  2. Use a countertop RO for drinking water. If you don’t want to touch the fridge plumbing, the AquaTru Countertop RO sits on the counter and gives RO-grade drinking water with zero install.
  3. Stop using fridge water for drinking until then. Keep the ice maker and cold water for convenience, but pour your drinking water from a microplastic-rated pitcher instead.

Frequently Asked Questions

Does my fridge water filter remove microplastics?
Almost certainly not at any meaningful rate. Most refrigerator filters are certified to NSF 42 (taste, chlorine) and sometimes NSF 53 (lead) — not NSF P473 (microplastics). Their carbon cartridges operate at 0.5–20 micron pore sizes, too coarse to block most microplastic particles.
Are there any microplastic-certified refrigerator filters?
A handful of premium aftermarket fridge filters claim particulate Class I performance (0.5–1μm), which catches larger fragments. None on the consumer market currently carry full NSF/ANSI P473 certification. The reliable solution is plumbing a reverse osmosis system to the fridge’s water line.
What about the ice — does ice have microplastics?
Yes, if your fridge water has microplastics, your ice does too — freezing doesn’t remove or break them down. RO-filtered water feeding the ice maker is the only home solution that addresses this.
Does a Samsung / LG / Whirlpool fridge filter remove microplastics?
No major OEM fridge filter (Samsung DA29-00020B, LG LT1000P, Whirlpool EveryDrop EDR1RXD1, GE XWFE) carries NSF/ANSI P473 certification for microplastics. They’re built around 0.5–1μm carbon blocks for chlorine and sediment, not membrane-grade particle filtration.
Can I add an inline microplastic filter to the fridge line?
Yes — an under-sink RO system can be tee’d into the fridge’s cold-water supply line. This gives RO-filtered water to both the dispenser and the ice maker without modifying the fridge. It’s a ~1-hour plumbing job. See our under-sink filter brief for specific units.
Are aftermarket fridge filters better than OEM for microplastics?
Generally no. “Compatible” cartridges from Waterdrop, Glacier Fresh, and similar brands are built to match the OEM slot and OEM certifications (NSF 42/53). None currently carry NSF P473 certification for microplastics either.

For the full comparison of microplastic filtration options, see our guide to the best water filter for removing microplastics.

This article is for informational purposes only and does not constitute medical advice.

Source: Kosuth, M., Mason, S. A., & Wattenberg, E. V. “Anthropogenic contamination of tap water, beer, and sea salt.” PLOS ONE, Volume 13, Issue 4, 2018. DOI