Berkey · Shower Filters
Berkey Shower Head Filter Refill Replacement
Lower PFAS concern; standard activated-carbon shower filters rarely use Teflon-family coating, but Berkey provides no transparency.
Berkey shower filters use activated carbon as the primary filtration media, a material with lower inherent PFAS risk compared to nonstick coatings or Teflon-family coating-treated surfaces. However, Berkey does not publicly disclose PFAS content or sources, and no third-party testing data is readily available.
Shop Berkey on Amazon →Material
Activated carbon filter media (likely coconut or coal-based)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
This refill is activated carbon, most likely derived from coconut shell or coal. Activated carbon works by adsorption, trapping chlorine, chloramines, and some volatile organic compounds in its porous structure rather than adding chemicals. The media is inert once cured and does not degrade into the water under normal shower temperature and pressure conditions (typically 40-50°C). No binders, adhesives, or dyes are reported in the product specifications.
The brand's record and disclosure
Berkey is a private, closely held company with limited third-party certification or transparency on sourcing and testing. The brand does not publish safety data sheets, material origin details, or independent lab certifications (e.g., NSF, WQA) for this specific refill. No product recalls or safety complaints have entered public record. The company's silence on manufacturing standards and quality assurance is noteworthy given the premium price positioning.
How it compares in its category
Activated-carbon shower filters are a low-risk category overall; most major brands (Aquasana, PUR, Sprite) use similar coconut or coal carbon without reported leaching hazards. Berkey's advantage is longevity claims (18 months per refill vs. 6-12 months for competitors), but this depends on water hardness and chlorine load, which Berkey does not help consumers assess. Competitor transparency on certifications typically exceeds Berkey's.
If you buy it
Replace the cartridge every 18 months or if flow slows noticeably; mineral scale can clog carbon faster in hard water. Store unused refills in a cool, dry place away from direct sunlight to avoid moisture absorption. Do not exceed the maximum flow rate (typically 2.5 gpm for Berkey heads) or carbon may channel and reduce effectiveness. Clean the shower head housing before installing a new refill to prevent bacterial film on the exterior.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Bacterial growth on filter housing
Activated carbon itself is inert, but the plastic or metal housing around the cartridge can harbor biofilm if not cleaned regularly, particularly in warm shower environments. Berkey does not provide guidance on housing sanitation or material specifications for the head casing.
Carbon dust or particle release during installation
New activated-carbon cartridges may shed fine particles into the first few minutes of water flow. This is not toxic but can be irritating to eyes and lungs if inhaled. Running water through the refill for 30 seconds before first use minimizes this risk.
Housing material leachables (unknown composition)
Berkey does not disclose the material of the cartridge housing or connecting fittings. If plastic components are used, unidentified polymers or adhesives could theoretically leach under warm water, though no incidents have been reported for this product line.
Ineffectiveness claims vs. testing
Independent water testing forums have questioned whether Berkey shower filters remove chloramines as effectively as claimed; the company does not publish NSF certification data or contaminant reduction claims with specific percentages, making effectiveness difficult to verify.
Heavy metals in source carbon (coal-based)
Coal-derived activated carbon can theoretically contain trace arsenic or other minerals; Berkey does not publish purity testing or origin certification. Coconut-shell carbon (lower risk) sourcing is not confirmed. No leaching incidents are on record.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Shower Filters
Showerhead Filter
Mist 5-Mode High Pressure Filtered Shower Head
ABS plastic head, stainless steel or brass internals, activated carbon filter media
Lower concern, but no PFAS transparency, standard shower filter with no red flags or assurances.
✓Bare metal or glass, no coating at all
PureAction
Shower Head Filter For Hard Water - 7 Settings High
activated carbon, likely stainless steel/brass cartridge housing
Lower PFAS concern for typical carbon-filter shower heads; verify specific cartridge composition with seller.
✓Bare metal or glass, no coating at all
PureAction
Luxury Filtered Shower Head with Handheld Hose, Bathroom
Typically stainless steel body and head with replaceable activated carbon filter cartridge
Lower concern for PFAS, but verify cartridge material and request disclosure if purchasing.
✓Bare metal or glass, no coating at all
More shower filters grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.