Countertop dispenser · checked 16 Oct 2026
Berkey Big Berkey System with 2 Black Berkey Elements
Model BK4X2-BB · replacement filter BB9-2
Lead:Brand claim onlyPFAS:Brand claim only
Each claim, checked
What the brand says, what a certification listing shows for this model, and where each fact comes from. We read listings; we do not test products.
- Certified (listing checked)The certifier’s public listing shows this claim for this model.
- Brand says certifiedThe brand says certified; IAPMO’s listing does not show it. NSF can be checked by hand.
- Brand claim onlyThe brand claims it without citing a certification.
| Contaminant | Brand claim | Standard | Certifier | Confirmed? | Source, date checked |
|---|---|---|---|---|---|
| Lead | “HEAVY METALS (HIGH & LOW pH LEVELS) Aluminum; Antimony; Barium; Beryllium; Bismuth; Cadmium; Cobalt; Chromium; Chromium 6; Copper; Iron; Lead; Mercury;” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| PFOA | “Black Berkey® Elements: The Final Barrier against PFOA and Other PFCs in Drinking Water” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| PFAS (no compounds named) | “Black Berkey® Elements dramatically reduce trihalomethanes, inorganic minerals, heavy metals, pharmaceuticals, pesticides, VOCs, petroleum products, perfluorinated chemicals, rust, silt, sediment, radiologicals, and more.” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Trihalomethanes (TTHM) | Same statement as for PFAS (no compounds named). brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Pharmaceuticals | Same statement as for PFAS (no compounds named). brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Pesticides and herbicides | Same statement as for PFAS (no compounds named). brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| VOCs (volatile organic chemicals) | Same statement as for PFAS (no compounds named). brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Other | Same statement as for PFAS (no compounds named). brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Mercury | Same statement as for Lead. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Chromium-6 | Same statement as for Lead. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Chlorine | “INORGANIC MINERALS Removed to Below Lab Detectable Limits: Chloramine; Chloride; Chlorine Residual (Total Residual Chlorine); Free Chlorine” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Chloramine | Same statement as for Chlorine. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Arsenic | “ALSO REMOVES OR REDUCES: Arsenic;” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
Filter changes, by the brand’s numbers
How often Berkey says to replace each part. Real filter life depends on how much water you use and what is in it.
| Part | Brand says replace every | Changes a year | Source, date checked |
|---|---|---|---|
| Black Berkey Elements (BB9-2, set of 2) | 6,000 gallons“We recommend replacing Black Berkey® Elements every 3,000 gallons (6,000 per set of 2 elements).” | depends on use | brand sourcechecked 16 Oct 2026 |
Certification listings found
No IAPMO R&T listing matched this model when we searched on 16 Oct 2026.
Check it yourself
NSF’s and WQA’s terms don’t allow automated lookups, so these links open their public listings for this model:
- NSF listing search: BK4X2-BB
- NSF listing search: BB9-2
- NSF listing search: Berkey
- WQA listing search: BK4X2-BB
- WQA listing search: BB9-2
- WQA listing search: Berkey
- IAPMO R&T listing directory
What the brand says about certification
- “Black Berkey® Elements have been tested by accredited third-party labs that have reported that the elements meet ANSI/NSF (Std. 53) protocol, and address over 200+ typical contaminants found in drinking water sources.” source checked 16 Oct 2026
- “Black Berkey® Elements are the leader in gravity-fed water Filtration, backed by independent testing” source checked 16 Oct 2026
- “The Black Berkey® Element formulation has been tested by accredited third-party laboratories to exceed NSF/ANSI Standard 53.” source checked 16 Oct 2026