Atomy Co ASFS-D6-201
A NSF/WQA-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.
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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 | Check on Amazon → |
| Replacement filter (ASFS-D6-201 ASFS-D6-202) | Find replacement → |
| Estimated yearly cost (filters, ~1.5×/yr) | — |
| True cost per gallon | — |
Cost per gallon and yearly cost are our estimates from the rated capacity and current prices. The filter only works if you replace it on schedule.
What it's certified to remove
Certification is per-contaminant: the Atomy Co ASFS-D6-201 is credited only for the contaminants listed here, verified by NSF/WQA. It does not imply removal of anything not listed.
✓ Verify this certification on the official NSF listing →
Full specifications
| Certified by | NSF, WQA |
| NSF/ANSI standards | 42 — reduces taste, odor, and chlorine (aesthetic standard) · 401 — reduces emerging contaminants such as pharmaceuticals and pesticides |
| Filter type | Under-sink filter |
| Rated capacity | 792 gallons |
| Flow rate | .264 gpm |
| Replacement element | ASFS-D6-201 ASFS-D6-202 |
| Installation | Mounts under the sink; connects to the cold line. Basic DIY. |
Frequently asked
Is the Atomy Co ASFS-D6-201 NSF certified?
Yes — the Atomy Co ASFS-D6-201 is listed in the NSF, WQA certified-product database under NSF/ANSI standards 42, 401. That means an independent body verified its claims (not just "tested to" a standard).
What does the Atomy Co ASFS-D6-201 remove?
It is certified to reduce 1 contaminants: Chlorine / chloramine.
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 ASFS-D6-201 ASFS-D6-202). Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar under-sink filters
Source: NSF, WQA 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.