Kohler Aquifer Shower Filter (K-22321) review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 9.5/10, 3rd of the 15 shower filters we track. At $97.50 it costs the same as the category median of $97.50. Its IAPMO listing covers chlorine only (NSF/ANSI 177). None of the 15 shower filters is listed for a health claim. Its cartridge cost of about $75 a year is below the $76-a-year median of the 15 shower filters with a stated cartridge cost.
- Price
- $97.50
- Certified for
- Chlorine
- Flow
- 3 gpm
- Cartridge life
- 8,000 gal
- Cost per year
- $75
- Warranty
- 1 year limited
Certification
Listed by IAPMO under NSF/ANSI 177 for Chlorine, checked Oct 15, 2026. Search the IAPMO listings
- Chlorine
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
90 days from shipment (kohler.com, new and saleable).
Warranty: 1 year limited. Returns: 90 days from shipment (kohler.com, new and saleable). Shipping: not stated by the brand. Source: Kohler data sheet, checked Oct 15, 2026.
Source: Kohler data sheet, checked Oct 15, 2026.
Compared with similar shower filters
All 15 shower filters →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Kohler Aquifer Hand Shower Filter (K-30646) | $82.50 | Brand claims only | $64 | 5 years limited | 9.25/10 | Check price → |
| Weddell Duo Shower Filter (WD-100) | $89.99 | Chlorine | $72 | Lifetime | 9.75/10 | Check price → |
| Kohler Aquifer Shower Filter (K-22321)THIS MODEL | $97.50 | Chlorine | $75 | 1 year limited | 9.5/10 | Check price → |
| Aquasana Shower Filter (AQ-4100NSH) | $119.99 | Brand claims only | $126 | 1 year | 8.75/10 | Check price → |
| Hydroviv Filtered Showerhead | $129.99 | Brand claims only | $209 | 5 years | 8.5/10 | Check price → |
What owners say
Checked Oct 15, 2026Reviews only on the brand's own site. In our score this is 1.75 of 2 points. How we score
Store ratings change over time; the date shows when we checked.