Pentair · Countertop Filters
AquaTru AT100 Countertop Reverse Osmosis Water Purifier with pitcher
RO filters inherently lower PFAS concern. No brand disclosure available.
AquaTru uses reverse osmosis membranes and carbon filters, which are not Teflon-family coating coatings. No public PFAS claims or third-party testing data found from Pentair.
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RO membrane, carbon filters, food-grade plastics, stainless steel
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The AT100 uses a reverse osmosis membrane as its primary filtration stage, paired with activated carbon pre-filters and post-filters, all housed in food-grade plastic and stainless steel components. RO membranes are non-leaching and do not degrade into harmful chemicals under normal use; the carbon filters are inert once properly installed. Food-grade plastics (typically polyethylene or polypropylene in the pitcher and housing) do not contain BPA or phthalates by design and have low migration risk at room temperature.
The brand's record and disclosure
Pentair is a major water treatment manufacturer with NSF and WQA certifications for many products, though the AT100 specifically carries minimal public third-party testing documentation. The company does not publicly disclose PFAS removal testing or stance on PFAS in marketing materials, creating ambiguity despite RO's inherent capability. No recalls or safety controversies involving leachables or off-gassing have been documented for this model.
How it compares in its category
Countertop RO systems are among the most effective for broad contaminant removal, including PFAS, compared to pitcher filters (activated carbon only) or faucet-mounted options. The AT100 is mid-range in price and feature set; competing models from brands like Aquasana and iSpring use similar membrane technology and pose comparable hazard profiles. Pitcher-based RO systems are less common than cartridge-based, so head-to-head comparisons are limited, but the technology itself is well-established and safe.
If you buy it
Replace filters according to the manufacturer schedule (typically every 6-12 months for carbon; RO membrane every 2-3 years) to prevent bacterial biofilm growth in stagnant filter beds and maintain contaminant reduction. The pitcher should be kept at room temperature and not exposed to direct sunlight or heat above 120F, which could accelerate any plastic degradation. Store replacement filters in a cool, dry place to prevent mold or odor development. Rinse the system and pitcher thoroughly before first use to remove any manufacturing residue.
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 in filter housing if neglected
RO systems with standing water in the membrane chamber can develop biofilm if filters are not replaced on schedule or the system sits unused for extended periods. Pentair provides maintenance guidelines, but user compliance determines actual risk.
Leaching from food-grade plastics in pitcher and housing
Food-grade polyethylene and polypropylene used in this category do not contain BPA, phthalates, or other regulated endocrine disruptors. No documented cases of leaching from AT100-type pitchers at room temperature.
Activated carbon filter degradation and dust
If carbon filters are cracked or exceed replacement intervals, fine carbon particles can migrate into filtered water. Proper installation and timely replacement eliminate this risk.
Stainless steel corrosion or contamination
Food-grade stainless steel in the housing and fittings does not corrode or leach under normal tap water chemistry. No recalls or reported incidents for this model.
RO membrane contamination from improper storage or handling
Membranes are sensitive to freezing and bacterial seeding during installation. Pentair includes protective measures, but installation errors or storage below 32F could compromise membrane integrity and water quality.
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 Countertop Filters
ZeroWater
40-Cup Glass Water Filter Dispenser
borosilicate glass, plastic pitcher housing, ion-exchange resin cartridge
Lower concern on PFAS, but brand silence on cartridge composition is a missed transparency opportunity.
✓Bare metal or glass, no coating at all
ZeroWater
Culligan ZeroWater Technology 22-Cup Ready Water Filtration Dispenser
Plastic housing, activated carbon + ion-exchange resin filter media
Lower concern, but verify filter cartridge specs before relying on PFAS claims.
✓Brand claims PFAS-free (unverified)
LARQ
PureVis Pitcher
Borosilicate glass pitcher, activated carbon filter cartridge
Lower PFAS concern for the pitcher itself; verify filter cartridge sourcing if purchasing replacements.
✓Bare metal or glass, no coating at all
More countertop 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.