Aquifer Shower Filter 22321-CP vs Mist 5-Mode High Pressure Filtered Shower Head: which is safer?
Mist 5-Mode High Pressure Filtered Shower Head edges it on pure PFAS risk, but Kohler Aquifer Shower Filter 22321-CP wins overall once other hazards are counted.
Our pick
Kohler
Aquifer Shower Filter 22321-CP
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleCopper leaching from brass housing
PossibleBacterial or mold growth in saturated cartridge
PossibleCartridge integrity failure over time
Showerhead Filter
Mist 5-Mode High Pressure Filtered Shower Head
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleABS plastic thermal degradation
LikelyBacterial/fungal growth in filter media
PossibleBrass/copper leaching (if brass internals used)
Where these two actually differ
- We flag Copper leaching from brass housing, Bacterial or mold growth in saturated cartridge, Cartridge integrity failure over time and Unverified filtration claims on the Kohler and not on the Showerhead Filter.
- We flag ABS plastic thermal degradation, Bacterial/fungal growth in filter media, Brass/copper leaching (if brass internals used) and Filter media particulate shedding on the Showerhead Filter and not on the Kohler.
- The Kohler is Activated carbon & KDF-55 cartridge filter; brass/plastic housing where the Showerhead Filter is ABS plastic head, stainless steel or brass internals, activated carbon filter media, which is most of the difference in these two grades.
- These two are 5 points apart, close enough that price and fit should decide it rather than our grade.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More shower filters: see the full ranking