Everpure QL3B - 4PZ
A NSF-certified commercial filter that is certified to reduce 4 contaminants at about 0.3¢ per gallon.
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. Price as of July 15, 2026; check Amazon for the current price.
A commercial / foodservice water treatment unit.
Certified to reduce 4 contaminants.
Like most carbon filters, it does not remove fluoride — only reverse osmosis does that.
What it costs to own
| Upfront price | $42.8 |
| Replacement filter (4PZ) | Find replacement → |
| Estimated yearly cost (filters, ~2×/yr) | — |
| True cost per gallon | 0.3¢ |
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 Everpure QL3B - 4PZ 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) · 53 — certified for health contaminants such as lead, VOCs, and cysts · 401 — reduces emerging contaminants such as pharmaceuticals and pesticides |
| Filter type | Commercial filter |
| Rated capacity | 15,000 gallons |
| Flow rate | 2.5 gpm |
| Replacement element | 4PZ |
| Installation | Commercial installation. |
Frequently asked
Is the Everpure QL3B - 4PZ NSF certified?
Yes — the Everpure QL3B - 4PZ is listed in the NSF certified-product database under NSF/ANSI standards 42, 53, 401. That means an independent body verified its claims (not just "tested to" a standard).
What does the Everpure QL3B - 4PZ remove?
It is certified to reduce 4 contaminants: Chlorine / chloramine, Cryptosporidium, Giardia, Turbidity.
How much does the Everpure QL3B - 4PZ cost per gallon?
About 0.3¢ per gallon, based on its rated capacity of 15,000 gallons and current price.
How often do you replace the commercial filter?
A commercial filter like this is typically replaced about 2 times a year (replacement element 4PZ). Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar commercial filters
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.