PureLiving · Under-Sink RO Systems
Pure-75 Reverse Osmosis System | 2-Minute Filter Changes
Lower-concern choice; RO systems use standard media unlikely to contain PFAS, but brand makes no public commitment.
Reverse osmosis systems rely on membranes and carbon, materials not typically formulated with PFAS. PureLiving does not publicly disclose PFAS practices or hold third-party certifications.
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RO membrane, carbon, standard filter media
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
The Pure-75 uses a reverse osmosis membrane paired with carbon and sediment filter stages, all standard materials in the category. RO membranes are semi-permeable polymers that physically reject dissolved solids rather than chemically transforming water, so they don't leach into treated water under normal use. Carbon filters adsorb impurities but do not degrade into the filtrate; sediment pre-filters are typically polypropylene or similar inert media. None of these materials are documented sources of regulated contaminants in drinking water applications.
The brand's record and disclosure
PureLiving has no public record of safety testing disclosures, third-party certifications (NSF, WQA), or controversy regarding their RO systems. The brand makes no explicit PFAS commitment, which is standard for smaller manufacturers in this space; most RO system makers do not publicly address PFAS in filter media because standard carbon and membrane materials are not known to contain it. Absence of certification is not evidence of poor safety, but it does mean less independent verification than certified competitors.
How it compares in its category
Under-sink RO systems are among the lowest-risk water treatment options because the membrane physically filters rather than chemically treats water. The Pure-75's quick-change design reduces user contact with wet filters, which lowers risk of bacterial contamination during maintenance compared to cartridges requiring longer handling. Major competitors (Culligan, Aqua-Pure, Watts) offer similar material choices and comparable hazard profiles; the Pure-75 is not notably safer or riskier than mid-market alternatives.
If you buy it
Replace filters on the manufacturer's schedule (typically 6-12 months for carbon, 2-3 years for membrane) even if flow is adequate, as clogged media can harbor bacteria. Do not use the system with water hotter than 40°C (104°F), as high temperature can degrade the membrane and carbon coating. Store replacement filters in a cool, dry place; wet cartridges left at room temperature can support microbial growth before installation. Flush the membrane for 5-10 minutes after installation to clear residual manufacturing dust and activate the system.
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 maintenance is neglected
Any RO system with standing water between uses can develop biofilm if filters are not changed on schedule or if the unit sits unused for weeks. This is a maintenance issue, not a material defect; the Pure-75's quick-change design does not reduce this risk.
Membrane degradation under high temperature or pressure
Reverse osmosis membranes (typically polyamide composites) can soften or fail if exposed to water above 40°C or to chlorine without activated carbon pre-filtration. The Pure-75 includes carbon pre-filtering, but users must monitor inlet water temperature.
Leaching from plastic fittings and tubing
Standard food-grade polypropylene and polyethylene tubing used in RO systems are not documented sources of BPA or other endocrine disruptors in cold-water applications. No specific testing of Pure-75 fittings is on record, but the material class carries no established risk.
Carbon filter dust or particle shedding into water
New or damaged carbon cartridges can release fine black particles into treated water. Flushing the system for several minutes after filter replacement minimizes this; persistent black particles indicate the filter is degraded and should be replaced.
Waste water discharge quality
RO systems discharge concentrated reject water (typically 3-5 gallons per 1 gallon of clean water). This water is not intended for consumption and contains concentrated minerals and contaminants; proper drain routing is a plumbing concern, not a product safety hazard.
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 Under-Sink RO Systems
Aqua Guard
AQUASURE Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
RO membrane, carbon filters, stainless steel housing
Lower-concern RO system; standard filtration materials carry minimal PFAS risk, but brand is silent on the topic.
✓Bare metal or glass, no coating at all
Aqua Guard
AquaTru Under Sink Under Sink
Multi-stage filter cartridges (activated carbon, ion exchange resins)
Lower PFAS concern for standard under-sink filter use, but verify current cartridge specs before purchase.
✓Brand claims PFAS-free (unverified)
Home Master
TM Undersink Reverse Osmosis Water Filter System
Reverse osmosis membrane, carbon, sediment filters, stainless steel housing
Lower-concern RO filter system; no known PFAS materials identified, but brand makes no explicit PFAS commitment.
✓Bare metal or glass, no coating at all
More under-sink ro systems 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.