Does Hollow-fibre membrane pitcher have microplastics?

Water filters

Moderate exposure

Some plastic contact, but limited by material, temperature or contact time. Reasonable as a default.

Grade C58% confidencePlastic pitcher with a hollow-fibre membrane and carbon stage

0 · no plastic contact100 · constant contact

Two numbers, not one. Exposure is how much plastic contact this involves. Confidence is how much anyone has actually measured. How we score

The short answer

The strongest pitcher mechanism available. A hollow-fibre membrane rated around 0.2 microns is a physical barrier rather than an adsorption medium, which puts it below the size range a carbon block works in — though still well above nanoplastics.

Why Hollow-fibre membrane pitcher scores 32

A membrane physically excludes particles larger than its pore size; a carbon block adsorbs, which is a different and less absolute mechanism
Around 0.2 microns is finer than the Class I particulate range certified pitchers are tested against
Still a plastic pitcher holding water for days — the vessel is unchanged from any other jug
Membranes clog rather than silently degrade, so a failing filter announces itself by slowing down

Where the 32 comes from

Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.

Packaging contact: 14 / 30
Use conditions: 10 / 25
Measured release: 3 / 25
Polymer behaviour: 5 / 10
Processing: 0 / 10

Total exposure32 / 100

What we don't know

Nobody has counted particles in the output of any consumer filter, and the nanoplastic fraction — which the 2024 PNAS work suggests is around 90% of the count in bottled water — is two orders of magnitude below 0.2 microns and passes straight through. A better pitcher is still a pitcher.

This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →

Better options

Ordered by how much they change, not by how much they cost.

Under-sink reverse osmosis

the membrane that does reach below a micron

Decant into glass

so the plastic jug is not the final vessel

Check the one in your kitchen

This page scores Hollow-fibre membrane pitcher as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.

Scan my water filter

Sources behind this score

Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.

peer-reviewed2024
PNAS 2024 (Qian) — Counted roughly 240,000 plastic particles per litre in bottled water, about 90% of them nanoplastics that earlier optical methods could not see at all.
Limitation: Three unnamed US brands, small sample. It measured particles, not absorption or any health outcome, and the brands were not disclosed — so it cannot be attributed to a specific label.
agency2019
WHO 2019 — Concluded that microplastics in drinking water do not appear to pose a health risk at current levels, while calling the underlying evidence limited and urging more research.
Limitation: Predates the nanoplastic detection methods that changed the particle counts by three orders of magnitude. Its conclusion is about what was measurable in 2019.
peer-reviewed2018
Mason 2018 — 93% of 259 bottles across 11 international brands contained microplastic; an average of 325 particles per litre across all size classes.
Limitation: Nile-red staining and optical microscopy only reliably resolve particles above ~100 μm, so its counts are a floor, not a total. Lower numbers here do not mean less plastic than the 2024 study — they mean a less sensitive method.

Frequently Asked Questions

Does Hollow-fibre membrane pitcher have microplastics?

How was the Hollow-fibre membrane pitcher score of 32 calculated?

Five components, added: packaging contact 14/30, use conditions 10/25, measured release 3/25, polymer behaviour 5/10 and processing 0/10. The page computes the total from those parts rather than storing it, so the number cannot drift from the reasoning.

Is Hollow-fibre membrane pitcher safe?

The score does not answer that and we will not pretend it does. It measures plastic contact, which is a physical property of the product. Whether a given level of exposure affects health is an open question — the FDA states the current evidence does not demonstrate a risk at the levels found in food, while research such as the 2024 NEJM plaque study gives real reasons to keep studying it. Both are true at once.

Why is the confidence only 58%?

No measurement of the product or its category exists. The score rests on published evidence about how this polymer behaves under these conditions — heat, abrasion, contact time, fat content. Because this is not a direct measurement of the product itself, the score should be read as a well-reasoned estimate that could move if someone tests it.