Culligan · Under-Sink RO Systems
Culligan G2-6 Plus Reverse Osmosis
Lower-concern choice for RO filtration; standard materials used, but Culligan makes no PFAS disclosure.
The Culligan G2-6 Plus uses reverse osmosis membranes and activated carbon, standard filtration materials with no known PFAS risk profile. The housing and cartridges are polypropylene, a conventional plastic unlikely to contain PFAS.
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Reverse osmosis membrane, carbon pre-filters, polypropylene housing
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 G2-6 Plus uses a reverse osmosis membrane (typically polyamide composite), polypropylene (PP) housing, and activated carbon pre-filters. Polypropylene does not leach BPA or phthalates under normal water-contact conditions and is chemically stable at room temperature. The carbon filters are inert once saturated and do not shed microplastics into water under intended use.
The brand's record and disclosure
Culligan has no public safety recalls specific to the G2-6 Plus model and no documented leaching incidents. The company makes no explicit PFAS transparency claims for this product line, which is typical for RO system manufacturers but reflects limited disclosure culture. Culligan holds NSF/ANSI certification for some product lines, though specific certification status for this model should be verified on packaging.
How it compares in its category
Under-sink RO systems are among the safest filtration categories because they use passive membrane technology and do not require electrical heating or chemical additives during normal operation. The G2-6 Plus sits in the mid-range consumer segment, competing against brands like Aqua-Pure and Watts, which have similar material profiles and equally silent PFAS stances. No category-wide hazard advantage or disadvantage is evident for this model.
If you buy it
Replace pre-filters every 6-12 months depending on feed water quality; the RO membrane typically lasts 2-3 years before rejection rates drop. Store the system at room temperature and drain it if unused for more than two weeks to prevent bacterial biofilm growth in the storage tank. Do not expose the plastic housing to direct sunlight or temperatures above 40°C (104°F). Verify that the storage tank is food-grade polypropylene and inspect it annually for visible cracks or discoloration.
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 storage tank
RO systems include a pressurized storage tank where stagnant water can support biofilm if the system sits unused or is not drained regularly. This is a maintenance issue, not a manufacturing defect, and is common across all under-sink RO brands.
Carbon pre-filter dust or fines
Activated carbon filters can shed fine particles during initial use or if housing integrity is compromised. Rinsing the system for 5-10 minutes before first use mitigates this; no long-term health risk is documented.
Polypropylene housing leachables
Polypropylene is chemically inert to cold water. No reports of odor, taste, or contamination from the G2-6 Plus housing exist in public records or consumer forums.
RO membrane integrity and microplastics
Polyamide RO membranes do not degrade into microplastics under normal pressure and temperature conditions. Membrane failure results in reduced filtration, not shedding into water.
Leaching from metal or soldered components
The G2-6 Plus uses food-grade brass or stainless steel fittings (typical for this category), and no lead solder is documented in consumer or industry sources. Lead in fittings is not a reported issue for this model.
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.