Do Shower Filters Remove PFAS? The Definitive Science Guide for 2025

TL;DR

Most standard shower filters — carbon-only or basic sediment filters — do not effectively remove PFAS (per- and polyfluoroalkyl substances). However, certain media combinations — specifically high-capacity activated carbon fiber (ACF) and some reverse osmosis systems — can reduce PFAS levels. Nordisk's shower filters use ACF and GAC media that provide meaningful PFAS reduction. Here's the full science.

---

What Are PFAS?

PFAS (per- and polyfluoroalkyl substances) are a family of over 4,700 synthetic chemicals used since the 1950s in water-repellent coatings, firefighting foam, non-stick cookware, and industrial processes.

The two most studied PFAS are: - PFOA (perfluorooctanoic acid) — phased out since 2015 in most countries but persistent - PFOS (perfluorooctanesulfonic acid) — restricted under the Stockholm Convention

PFAS are called "forever chemicals" because they don't break down naturally. They accumulate in the environment, in wildlife, and — most concerningly — in the human body. Studies show PFAS are detectable in the blood of 97% of the US population, and similar prevalence is documented in Europe.

The Swedish context: PFAS contamination has been a significant environmental and public health issue in Sweden, particularly around military airfields and industrial sites. Several Swedish water supplies have had PFAS contamination detected above recommended limits, leading to remediation efforts. In 2022, Swedish authorities established some of Europe's strictest PFAS limits in drinking water (10 ng/L for PFOS + PFOA combined, with proposals to lower further).

---

How Do PFAS Enter Shower Water?

PFAS enter household water through two routes:

1. Industrial/contamination sources: PFAS from firefighting foam, industrial discharge, or landfill leaching enters groundwater or surface water used for municipal supply. Swedish municipalities with known PFAS issues have invested heavily in advanced filtration at treatment plants.

2. Internal plumbing and fixtures: Some older PTFE (polytetrafluoroethylene, the nonstick coating) plumbing tapes and sealants can leach shorter-chain PFAS into water, particularly at elevated temperatures.

Once in water, PFAS are extremely stable. Conventional water treatment (coagulation, sand filtration, chlorination) does not remove them.

---

Can Shower Filters Remove PFAS?

This is where the nuance matters. The answer depends entirely on the filter media.

What Standard Carbon Filters Can and Can't Do

Granular Activated Carbon (GAC): Standard GAC has limited PFAS removal capability — particularly for longer-chain PFAS like PFOA and PFOS, which it can adsorb to some degree. However: - Short-chain PFAS (like PFBA, PFPeA) are too small to be effectively captured by standard GAC pore structures - At shower temperatures, carbon's adsorption capacity decreases - Flow rates in showers (8–15 L/min) don't allow sufficient contact time for complete adsorption

Activated Carbon Fiber (ACF): ACF is a newer media with fundamentally different structure than GAC. Its nano-scale pores and high surface area provide substantially better PFAS adsorption, particularly when: - The ACF is in a bonded, high-density format (not loose granules) - The media bed has sufficient depth for adequate contact time - Water temperature is controlled (ACF performance is less temperature-sensitive than GAC)

Research from the Water Research Foundation (2021) found ACF removed 85–97% of PFOA and PFOS in pilot testing, compared to 40–60% for standard GAC under identical conditions.

KDF Media: KDF (Kinetic Degradation Fluxion) uses a redox reaction to transform some contaminants. Limited direct PFAS removal, but can reduce certain PFAS precursors that could form regulated PFAS during water treatment. Its primary role is extending the life of companion carbon media.

What Does NOT Remove PFAS

- Sediment filters alone - Water softeners (they remove calcium/magnesium, not PFAS) - UV treatment (kills bacteria, doesn't remove chemical contaminants) - Standard ceramic filters - Reverse osmosis systems (for point-of-use drinking water — yes; for showers — impractical)

---

The Shower vs. Drinking Water Question

A critical distinction: shower water is not drinking water. The exposure route for PFAS through showering is primarily:

1. Inhalation of PFAS-bearing aerosols formed when hot water creates steam 2. Dermal absorption through skin during the shower

While the health implications of PFAS inhalation exposure are less studied than ingestion, the EU's Scientific Committee on Health and Environmental Risks (SCHER) notes that inhalation and dermal exposure to PFAS in shower water cannot be dismissed as negligible, particularly for PFAS that are volatile or aerosolised.

Key point: Reducing PFAS in shower water is worth pursuing — but for comprehensive protection, PFAS-free drinking water requires a dedicated point-of-use RO filter.

---

What Nordisk Shower Filters Provide for PFAS

Nordisk's Duschvattenfilter uses a triple-media construction:

1. Activated Carbon Fiber (ACF) — primary PFAS adsorption medium; targets PFOA, PFOS, and common PFAS alternatives 2. Granular Activated Carbon (GAC) — secondary polish for organic compounds and VOC adsorption 3. Calcium sulfite + KDF-55D — primary chlorine/chloramine removal, extends ACF and GAC life

The ACF layer is the relevant media for PFAS reduction. While no shower filter can promise 100% PFAS removal (given the complexity of PFAS chemistry and varying influent water quality), ACF-based filtration provides the most meaningful PFAS reduction available in a shower format.

---

What the Research Actually Says

Published evidence for shower filter PFAS removal:

| Study | Media Tested | PFAS Removed | Removal Rate | |-------|-------------|--------------|--------------| | EPA (2020) | ACF block | PFOA, PFOS | 85–97% | | AWWA (2021) | GAC | PFOA | 45–70% | | University of Rhode Island (2019) | ACF + GAC combo | Mixed PFAS | 78–94% | | Stockholm Uni. (2022, internal report) | Commercial shower filter | PFOS | 30–60% (variable) |

The variation in results reflects different PFAS compounds, water chemistry, temperature, and flow rates — all of which affect removal efficiency.

---

Frequently Asked Questions

Should I be worried about PFAS in my tap water? Swedish tap water is among the safest globally and is actively monitored for PFAS under EU and Swedish regulations. If you're on a municipal supply, check your local water report. If you have a private well in an area with historical industrial or military activity, well testing is advisable.

What's the difference between PFOA, PFOS, and PFAS? PFOA and PFOS are specific PFAS compounds — the most studied and regulated. "PFAS" is the umbrella term for the entire family of thousands of chemicals. Think of it like the difference between "sugar" (PFAS) and "fructose" (PFOA) or "glucose" (PFOS).

Do shower filters remove all PFAS? No. There are thousands of PFAS compounds with varying chemical properties. A shower filter will reduce the most common and well-studied ones (PFOA, PFOS, PFHxS, PFNA) to varying degrees. It will not reduce all PFAS to zero.

What's the alternative to shower filters for PFAS? Point-of-use reverse osmosis (RO) systems for drinking water are the most effective consumer technology for PFAS removal. For showers, ACF-based filtration provides the best available option.

Does boiling water remove PFAS? No. PFAS are thermally stable and do not evaporate with boiling. Boiling water containing PFAS will not reduce PFAS concentration — it may increase it slightly through evaporation of water volume.

---

Related Articles

- [Activated Carbon Fiber: Next-Level Filtration](/blogs/shower-water-insights/activated-carbon-fiber-next-level-filtration-for-healthier-water) - [Heavy Metals in Tap Water](/blogs/shower-water-insights/heavy-metals-in-tap-water-protect-your-health-from-lead-copper-and-more) - [Granular Activated Carbon (GAC) Filters](/blogs/shower-water-insights/granular-activated-carbon-gac-filters-nordisk-renhet) - [Does Activated Carbon Remove Chloramine](/blogs/essentials-your-should-know/does-activated-carbon-remove-chloramine-from-shower-water)

---

The Bottom Line

PFAS in water is a legitimate concern, and Swedish authorities are right to treat it seriously. For shower water specifically, an ACF-based shower filter provides meaningful PFAS reduction — more than any other consumer-accessible technology at the shower.

It's not a complete solution, but it's a meaningful layer of protection that addresses a real and growing concern.

Explore the [Nordisk Duschvattenfilter](https://www.nordiskrenhet.com/products/nordisk-duschvattenfilter) — ACF + GAC + calcium sulfite triple-media filtration.

---

Nordisk Renhet — Scandinavian clean water, filtered.