Clearly Filtered · Water Filters
Clearly Filtered 32oz Water Bottle/Targets 220+ Contaminants/Double-Wall Insulated Stainless Steel Filtered Water Bottle
Lower concern. Stainless steel and activated carbon are not materials linked to PFAS.
This product is made of double-wall stainless steel with an internal activated carbon filter. The brand has no PFAS statement on record. The materials as recorded are not typically associated with PFAS.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel double-wall, internal activated carbon filter
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Clearly Filtered 32oz Water is made of, ingredients and materials
The bottle uses food-grade 18/8 stainless steel (double-wall insulated), which is chemically inert and does not leach metals or chemicals into water under normal use. The internal filter cartridge uses activated carbon, a passive medium that traps contaminants mechanically and through adsorption without releasing byproducts. Stainless steel and carbon are inherently stable materials with no known off-gassing or leaching pathways relevant to drinking water.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Bacterial growth in filter housing
Activated carbon and filter housings can harbor biofilm and bacterial growth if cartridges are not replaced regularly or if the bottle is left wet for extended periods. This is a maintenance issue, not a materials hazard, but neglect creates health risk independent of the filter's contaminant-blocking ability.
Filter efficacy degradation without clear guidance
The brand claims 220+ contaminants but does not specify which ones, reduction percentages, or how long the filter remains effective. Without third-party NSF certification, consumers cannot independently verify when filtration performance drops below acceptable thresholds.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Filter cartridge leachables (plastic or adhesive components)
Clearly Filtered does not disclose whether filter cartridges contain plastic binders, epoxy adhesives, or other synthetic materials that could degrade with use. Activated carbon alone does not leach, but the cartridge housing and seals may; no contamination incidents are on record, but full material transparency is absent.
Stainless steel leaching (nickel)
Food-grade 18/8 stainless steel does not leach nickel under normal drinking water conditions; this is an extremely low risk for passive storage. Risk only increases if water is highly acidic (pH below 3) or if the bottle is damaged or corroded, neither of which are typical use scenarios.
Double-wall seal integrity over time
Double-wall insulation relies on vacuum seals; if seals degrade, water can accumulate between walls, creating mold or mineral buildup. No field failures are documented for this model, but seal degradation is a known durability risk in stainless steel double-wall bottles.
The full breakdown
The brand's record and disclosure
Clearly Filtered does not publish third-party NSF/ANSI certifications or independent contaminant-reduction testing results on their public materials, though they claim filtration of 220+ contaminants without specifying methodology or reduction percentages. No recalls, litigation, or contamination incidents involving this bottle model appear in public records. The brand's silence on material sourcing and filter composition standards limits transparency but does not indicate known problems.
How it compares in its category
Stainless steel bottles with carbon filters are a mid-tier approach, lower concern than plastic bottles (which carry BPA/BPS leaching risk if damaged or heated) but less comprehensive than whole-home multi-stage systems. Most competitors in this category (e.g., Hydro Flask, S'well, Nalgene with aftermarket filters) use similar stainless construction; Clearly Filtered's main differentiator is the integrated filter cartridge rather than material innovation. Replacement filters are a consumable cost and maintenance burden not required by passive stainless bottles.
If you buy it
Replace filter cartridges on the manufacturer's recommended schedule (typically every 2-3 months with average use) to prevent bacterial biofilm buildup and degraded contaminant adsorption. Do not submerge the filter mechanism in dishwashers; hand-wash the bottle and replace cartridges dry. Stainless steel is durable in freezers and with hot liquids, but verify that filter seals remain intact after thermal cycling. Store unused filters in a cool, dry place; activated carbon loses adsorptive capacity over time even if unused.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Clearly Filtered has made none
Formulations change between production runs, so check the current label. How we grade.
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