Kohler Review, Is Kohler Non-Toxic?
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Across 3 graded products, Kohler averages Excellent (95/100). On disclosure, the brand says nothing publicly about PFAS. 3 of its products grade Good or better. Grades are model-based estimates, not lab results.
Worth buying from Kohler Good or better, safest first
Kohler
Aquifer Shower Water Filtration System
Activated carbon filter media, plastic housing
Bacterial biofilm growth in filter media
Activated carbon can support microbial growth if the filter is not replaced regularly or…
Filter media degradation or contaminant breakthrough
Exhausted carbon loses capacity to trap chlorine and organic compounds; continued use…
Lower PFAS concern for typical carbon and plastic filtration, but brand has not disclosed PFAS use.
⚠Brand says nothing about PFAS
Kohler
Cinq Showerhead Replacement Filter
activated carbon filter cartridge (typical composition for KOHLER Cinq)
Bacterial growth in spent or unmaintained filter
Activated carbon media, once saturated, can become a substrate for bacterial biofilm if…
Filter effectiveness degradation or false sense of security
Shower filters are not certified to remove all contaminants; saturation reduces chlorine…
Lower-concern choice; carbon filters are standard, but verify Kohler's formulation with customer service.
⚠Brand says nothing about PFAS
Kohler
Aquifer Shower Filter 22321-CP
Activated carbon & KDF-55 cartridge filter; brass/plastic housing
Copper leaching from brass housing
Brass fittings can leach copper into standing water, but shower filters see constant flow…
Bacterial or mold growth in saturated cartridge
Activated carbon is porous and, once saturated with chlorine, can become a substrate for…
Cartridge integrity failure over time
Activated carbon is friable; if a cartridge cracks or degrades, fines can shed into…
Unverified filtration claims
Kohler does not provide third-party certified data on what this filter removes or to what…
Lower concern; standard carbon and KDF filter with no known PFAS risks, brand offers no transparency.
⚠Brand says nothing about PFAS
Every grade uses the same public rubric. How grades work →