Contaminant · Free chlorine
What water filters remove chlorine
Free chlorine
The short answer
Free chlorine reduction is certified under NSF/ANSI 42 and NSF/ANSI 177. The federal MCL is 4 mg/L.
Of the 1 system in our database that advertise chlorine reduction, 1 holds a matching third-party listing.
- NSF/ANSI 421 of the 1 certified systems we hold carry this claim under NSF/ANSI 42.
- NSF/ANSI 177NSF/ANSI 177 permits this claim, but no system we hold carries it under that standard.
Regulatory status · United States
- Current federal limit
- 4 mg/L
- Free chlorine. Milligrams per litre.
- Status
- ✓In force
- Pending change
- None recorded.
Settled. We re-check the federal register entry quarterly and stamp this panel with the date of the last check.
Certified to reduce Free chlorine
1 systemEvery row below has a matching listing in a certifier database, checked on 20 Sep 2026. Sorted by FilterSpecs score.
| System | Score | Reduction | Standard | Price |
|---|---|---|---|---|
| GE Appliances GXRV40TBN Reverse Osmosis Drinking Water System | 5.9 | Not published | NSF/ANSI 42 | $259.99 |
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Reduction figures are the certified performance in the listing, not manufacturer marketing. See methodology.