Sub-Zero · Refrigerator Filters
Replacement 4204490 Water Filter and 7007067 Air Purification Cartridge Combo Pack, Compatible with Sub-Zero 4204490, 4290510 Water Filter, 7042798/
Skip until Sub-Zero discloses filter composition and PFAS testing, third-party replacements lack material transparency.
This aftermarket Sub-Zero filter combo provides no public disclosure of media composition or PFAS testing. While activated carbon and mechanical filters are generally lower-concern materials, Sub-Zero's silence on their specific cartridge construction and any treatments applied leaves significant uncertainty.
Shop Sub-Zero on Amazon →Material
Activated carbon and mechanical filter media (proprietary composition unspecified)
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 combo pack contains activated carbon (mechanical filtration media) and unspecified proprietary filter materials for both water and air purification in Sub-Zero refrigerators. Activated carbon is generally recognized as safe for food contact and does not leach into water under normal use, but Sub-Zero has not publicly disclosed the full composition of binder resins, mechanical media, or housing materials in these cartridges. Without transparency on manufacturing processes and material sourcing, potential off-gassing or particulate shedding cannot be fully assessed.
The brand's record and disclosure
Sub-Zero has not published independent safety certifications, material composition sheets, or third-party testing results for these replacement filters. The company has made no public commitment to PFAS screening or avoidance, which is increasingly standard in premium water filtration. No major recalls or safety incidents have been publicly documented for this specific product line, but the lack of proactive disclosure is atypical for a luxury appliance brand.
How it compares in its category
Refrigerator replacement filters from major brands (Whirlpool, LG, Samsung) increasingly publish NSF/ANSI certifications confirming contaminant reduction and material safety. Sub-Zero's proprietary design and silence on testing standards makes direct comparison difficult. Third-party compatible alternatives often lack the same manufacturing controls and are not recommended as substitutes due to unknown material sourcing.
If you buy it
Replace cartridges according to Sub-Zero's schedule (typically 6 to 12 months depending on water quality and usage) to prevent bacterial growth in stagnant filter media, which poses a greater risk than the filter itself. Do not attempt to clean or reuse these cartridges; they are single-use. Store unopened cartridges in a cool, dry place away from direct sunlight. If you notice discoloration, odor, or reduced water flow, replace immediately rather than extending use.
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 and biofilm in filter media
Activated carbon filters can harbor bacteria if not replaced on schedule or if water sits stagnant in the cartridge. This is a maintenance issue, not a material defect, but represents the most credible health risk in this product category.
Housing material leachables (unspecified plastic/resin composition)
Sub-Zero has not disclosed the polymer or epoxy resin used in cartridge housing or seals. Without material transparency, low-level leaching of binders or plasticizers cannot be ruled out, though no incidents have been reported for this product.
Activated carbon particulate shedding
Quality activated carbon cartridges are designed to minimize fines and particle release into filtered water. No testing data or complaints are on record for Sub-Zero filters, suggesting adequate manufacturing controls, but proprietary composition prevents independent verification.
Off-gassing from proprietary filter media
Some mechanical filter media can release volatile organic compounds during storage or initial use. No public reports exist for this product, and activated carbon itself is inert; however, binders and sizing agents in the proprietary formulation remain undisclosed.
Cross-contamination if filter housing cracks or seals fail
Improper installation or housing defects could allow unfiltered water to bypass the cartridge. This is a quality control risk rather than a material toxicity issue, but emphasizes the importance of following installation instructions precisely.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% 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 Refrigerator Filters
Kenmore
9690 Refrigerator Water Filter 1-Pack, Nsf/wqa/iapmo Certified, Reduces 99% Chlorine & Odor, BPA-Free, Replacement for 46-9690 469690 Lt700p
activated carbon filter cartridge
Lower-concern water filter; carbon-based design unlikely to contain PFAS, but Kenmore makes no explicit PFAS disclosure.
✓Verified PFAS-free by a third party
Kenmore
Pureline Filter Compatible with Whirlpool Everydrop Filter 1
Activated carbon and fiberglass filter media
Lower concern for PFAS; standard cartridge filter with no known PFAS-bearing materials, but brand offers no transparency.
✓Bare metal or glass, no coating at all
Clearly Filtered
Water Pitcher Replacement Filter 3-Pack
Activated carbon and ion-exchange resin filter media
Lower-concern option; activated carbon filters are standard PFAS-reduction media, but verify pitcher durability and actual tested removal rates independently.
✓Brand claims PFAS-free (unverified)
More refrigerator 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.