Rheem · Whole-House Filters
Rheem AllClear Water Treatment System RTG20251
Lower concern filter; typical GAC design, but no PFAS disclosure, transparency would help.
The Rheem RTG20251 is a standard activated-carbon water filter cartridge with no known PFAS-containing coatings or membranes in its basic design. Rheem has not publicly disclosed PFAS risk or made PFAS-free claims for this model.
Shop Rheem on Amazon →Material
carbon/granular activated carbon filter cartridge
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 RTG20251 uses granular activated carbon (GAC) as its primary filtration medium, a porous material created by heating carbon at high temperatures to create tiny air pockets that trap contaminants. GAC is chemically inert and does not leach harmful compounds into water under normal conditions. The cartridge housing is typically polypropylene or similar food-grade plastic, materials chosen to resist water contact without releasing BPA or phthalates under the low-temperature, low-pressure conditions of residential filtration.
The brand's record and disclosure
Rheem is a major HVAC and water treatment manufacturer with long operational history but limited public transparency on specific water filter safety testing or third-party certifications for the RTG20251 line. The brand does not publicly disclose PFAS removal claims or test data on its website, which is notable given rising consumer awareness. No major recalls or safety incidents involving this specific filter model are documented in public databases. Certification to NSF/WQA standards would be expected for whole-house filters but should be verified on the product packaging.
How it compares in its category
Whole-house GAC filters like this are a standard, low-risk category compared to pitcher filters or reverse osmosis systems; they have fewer failure modes and no electronic components. GAC cartridges require regular replacement (typically every 6-12 months depending on water quality) to prevent bacterial biofilm growth and maintain effectiveness, a maintenance burden similar to competitors like Aqua-Pure or 3M. Rheem's model positions as a mid-range option; premium filters often include additional stages (sediment, carbon block) or specific certifications that this product does not emphasize.
If you buy it
Replace cartridges every 6-12 months or per the manufacturer schedule, whichever comes first; exhausted filters lose capacity and can become reservoirs for bacterial growth if left in service. Do not attempt to clean or reuse cartridges; they are designed for single-use disposal. Store replacement cartridges in a cool, dry place away from direct sunlight to preserve the carbon's adsorption properties. Monitor water flow rate; a significant drop may indicate clogging and need for earlier replacement than the standard schedule.
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 biofilm growth in exhausted filter
If cartridge is not replaced on schedule, the moist GAC medium becomes a breeding ground for bacteria (particularly if water is not consistently treated). This is a use-maintenance issue, not a manufacturing defect, but failure to replace cartridges creates a water quality risk.
Housing material leaching (polypropylene or polyethylene)
Food-grade plastics used in filter housings are not documented to leach BPA, BPS, or phthalates under the ambient temperature and low-pressure conditions of residential water filtration. No incidents reported for Rheem's RTG20251 housing.
Activated carbon dust or particulate carryover
Freshly installed or damaged GAC cartridges may release fine carbon particles into water, causing temporary cloudiness or black specks. Pre-flushing the system for 5-10 minutes before use can minimize this; it is not a toxicity concern but an aesthetic and system cleanliness issue.
Pressure vessel failure or cartridge breach
Whole-house filter housings operate at relatively low pressure and are not typically subject to rupture; no documented manufacturing defects or housing failures in the RTG series. Proper installation per manual is required to avoid leaks.
Lack of third-party certification transparency
Rheem does not publicly disclose NSF, WQA, or other third-party certification for this specific model on its marketing materials, making it difficult for consumers to independently verify claimed contaminant removal rates. Requesting certification documentation from the seller is advisable.
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 Whole-House Filters
A.O. Smith
Ao Smith Ao-wh-pre Whole House Sediment Water Filter System Nsf 42
polypropylene sediment filter media, plastic housing
Lower PFAS concern for a basic sediment filter, but brand silence on materials limits full confidence.
✓Verified PFAS-free by a third party
Ecowater Systems
Ecowater Water Softener, 30000 Grains - EP7130
Ion-exchange resin beads, tank structure (likely fiberglass-reinforced plastic or polyester)
Lower concern, standard water softener with no known PFAS red flags, but brand transparency is absent.
✓Bare metal or glass, no coating at all
GE Appliances
Whole House Water Filtration System
Carbon and sediment filter media; housing plastic/stainless
Lower concern, but GE provides no PFAS transparency, contact them directly for filter composition.
✓Bare metal or glass, no coating at all
More whole-house 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.