3M CS-14
A NSF-certified under-sink filter that is certified to reduce 1 contaminant.
This listing is the certified replacement cartridge (the part you change on schedule), not a complete installed system. Its certification applies when used in the matching housing or system.
As an Amazon Associate we earn from qualifying purchases — disclosure. Amazon price as of October 20, 2026 at 2:01 PM ET; check Amazon for the current price.
You want strong contaminant reduction at the kitchen tap without a countertop unit, and are comfortable with a simple under-cabinet install.
Certified for taste, odor, and chlorine (an aesthetic filter).
This is an aesthetic-standard filter (NSF 42) — it improves taste and reduces chlorine, but is not certified for health contaminants like lead or PFAS.
What is under-sink filter? A carbon-based cartridge (or set of stages) plumbed under your kitchen sink that filters the cold drinking-water line. Compare all filter types →
What it costs to own
| Upfront price | $91.00 |
| Replacement filter (CS-14) | $91.00 Buy refill → |
| Estimated yearly cost (filters, ~1.5×/yr) | ~$137/yr |
| True cost per gallon | 3.6¢ |
Cost per gallon and yearly cost are our estimates from the rated capacity and the Amazon price as of October 20, 2026 at 2:01 PM ET. We show them only when we read the price from Amazon in the last 24 hours. The filter only works if you replace it on schedule.
What it's certified to remove
Certification is per-contaminant: the 3M CS-14 is credited only for the contaminants listed here, verified by NSF. It does not imply removal of anything not listed.
✓ Verify this certification on the official NSF listing →
Full specifications
| Certified by | NSF |
| NSF/ANSI standards | 42 — reduces taste, odor, and chlorine (aesthetic standard) |
| Filter type | Under-sink filter |
| Rated capacity | 2,500 gallons |
| Flow rate | 1 gpm |
| Replacement element | CS-14 |
| Installation | Mounts under the sink; connects to the cold line. Basic DIY. |
Frequently asked
Is the 3M CS-14 NSF certified?
Yes — the 3M CS-14 is listed in the NSF certified-product database under NSF/ANSI standard 42. That means an independent body verified its claims (not just "tested to" a standard).
What does the 3M CS-14 remove?
It is certified to reduce 1 contaminants: Chlorine / chloramine.
How much does the 3M CS-14 cost per gallon?
About 3.6¢ per gallon, based on its rated capacity of 2,500 gallons and the Amazon price on October 20, 2026 at 2:01 PM ET.
How often do you replace the under-sink filter?
A under-sink filter like this is typically replaced about 2 time a year (replacement element CS-14). Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar under-sink filters
Amazon prices as of October 20, 2026 at 2:01 PM ET; check Amazon for the current price.
Source: NSF public certification listing. Specs and certified claims are from the official listing; cost figures are our estimates. Some links are affiliate links — see our disclosure.