Whole-house filter · checked 16 Oct 2026
iSpring WGB21B 2-Stage Whole House Water Filtration System, with…
Model WGB21B · replacement parts FP15B, FC15B
Lead:not claimedPFAS:not claimed
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 |
|---|---|---|---|---|---|
| Chlorine | “removing up to 99% of chlorine, along with sediments, rust, tastes, odors, herbicides, and more for clean, odor-free water.” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Pesticides and herbicides | Same statement as for Chlorine. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Taste and odor | Same statement as for Chlorine. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| Particulates | Same statement as for Chlorine. brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
| VOCs (volatile organic chemicals) | “removes over 90% of sediment and chlorine from the water, and is highly effective on organic chemicals (VOCs) like pesticides, herbicides, and industrial chemicals.” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
Filter changes, by the brand’s numbers
How often iSpring 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 |
|---|---|---|---|
| FP15B 10" sediment filter (stage 1)The brand gives more than one figure for this part. | 12 months or 50,000 gallons“this water filter system delivers reliable performance for up to 50,000 gallons or 12 months, depending on water usage and quality.”15,000 gallons“Replacement Filters FC15B FP15B ... Life Cycle Up to 50,000 Gallons Up to 15,000 Gallons”6 months or 50,000 gallons“the cartridges inside of the WGB21B would last 50,000/300=166 days (Around 6 months) on average.” | 1 or 2 | brand sourcechecked 16 Oct 2026brand sourcechecked 16 Oct 2026brand sourcechecked 16 Oct 2026 |
| FC15B 10" CTO carbon block filter (stage 2)The brand gives more than one figure for this part. | 12 months or 50,000 gallons“this water filter system delivers reliable performance for up to 50,000 gallons or 12 months, depending on water usage and quality.”6 months or 50,000 gallons“the cartridges inside of the WGB21B would last 50,000/300=166 days (Around 6 months) on average.” | 1 or 2 | brand sourcechecked 16 Oct 2026brand 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: