Multipure
CB-EXTRA
System model CB-EXTRA
Plumbed-in carbon-block configuration listed by NSF with the CBXT replacement element. Installation kits vary; confirm the hardware separately.
Use the exact documented model and replacement configuration. Similar model names do not establish equivalent claims.
Document review ·
- Rated capacity
- 340 gal
- Service flow
- 0.71 gpm
- Replacement items
- 1
Replacement filters
Claims below apply to CB-EXTRA + CBXT as a complete configuration. Physical fit alone does not establish certified performance.
340 gallons / 12 months. Replace at the earlier of the documented volume or time limit; follow source instructions for any earlier replacement triggers. Capacity / component source · Time-limit source
NSF 53 PFOA/PFOS claims, where present, were evaluated to the 2021 version of that standard. They are not a total-PFAS claim. Pentavalent arsenic claims apply only to the source-specified influent of 50 ppb or less. VOC claims use surrogate testing. Time-based replacement has not been verified; follow the filter instructions. Replace at least annually; change sooner at rated capacity, reduced flow or other manufacturer replacement indicators.
Reduction claims
Checked against the public NSF listing. Only captured source-supported claims are shown; laboratory performance is not a guarantee for your water.
| Reduction claim | NSF/ANSI | Evidence |
|---|---|---|
| Chloramine | 42 | Source ↗ |
| Chlorine | 42 | Source ↗ |
| Particulate Class I | 42 | Source ↗ |
| Taste and Odor | 42 | Source ↗ |
| Asbestos | 53 | Source ↗ |
| Chlordane | 53 | Source ↗ |
| Cyst | 53 | Source ↗ |
| Lead | 53 | Source ↗ |
| MTBE | 53 | Source ↗ |
| Mercury | 53 | Source ↗ |
| PCB | 53 | Source ↗ |
| Toxaphene | 53 | Source ↗ |
| Turbidity | 53 | Source ↗ |
| VOC | 53 | Source ↗ |
| Arsenic (pentavalent) | 53 | Source ↗ |
| Microcystin | 53 | Source ↗ |
| PFOA | 53 | Source ↗ |
| PFOS | 53 | Source ↗ |
| Atenolol | 401 | Source ↗ |
| Bisphenol A | 401 | Source ↗ |
| Carbamazepine | 401 | Source ↗ |
| DEET | 401 | Source ↗ |
| Estrone | 401 | Source ↗ |
| Ibuprofen | 401 | Source ↗ |
| Linuron | 401 | Source ↗ |
| Meprobamate | 401 | Source ↗ |
| Metolachlor | 401 | Source ↗ |
| Microplastics | 401 | Source ↗ |
| Naproxen | 401 | Source ↗ |
| Nonylphenol | 401 | Source ↗ |
| Phenytoin | 401 | Source ↗ |
| Trimethoprim | 401 | Source ↗ |
| TCEP | 401 | Source ↗ |
| TCPP | 401 | Source ↗ |
Materials & structural scope
No separate materials-only record captured. This does not mean the system lacks materials certification.
Unlisted contaminants have no captured claim here. An absent catalog claim does not prove absence of certification.
Annual filter cost
- CBXT · 2 units / year$360.00
For each item: round up the larger of annual water use ÷ capacity and 12 ÷ replacement months, then multiply by quantity and unit price. This conservative full-year budget does not credit the filters supplied with a new system. Multi-pack prices are allocated per filter; buying whole packs can cost more. It excludes system purchase, hardware, optional upgrades, shipping, tax, labor, water and electricity. Editable prices are your assumptions.
Evidence & review
Reviewed 2026-09-21 · Codex document review. Document review, not independent laboratory testing.
Matched the exact system, replacement elements, claim-specific standard and operating limits against the archived source. This is an assisted document review, not laboratory testing or independent human certification.
Printed page 36: replace at least yearly, or sooner at rated capacity, reduced flow or taste/odor breakthrough. Page 47 repeats the rule in the performance-sheet operating requirements.
Original source archived for the September 2026 document review. Check the document revision and model-specific conditions.
CBXT: $180.00 per 1 unit(s), observed 2026-09-21. Observed manufacturer price for one complete replacement unit or kit; excludes delivery, tax and subscriptions.
Original source archived for the September 2026 document review. Check the document revision and model-specific conditions.
Follow the source document’s water-quality limits and conditions of use. Household filtration does not replace required disinfection.