iSpring · Whole-house
iSpring WGB21B 2-stage whole-house: what it removes and what it costs
Model: WGB21B (FP15B sediment + FC15B CTO carbon block, 10in x 4.5in; refill F2WGB21B)
The iSpring WGB21B 2-stage whole-house has no certifier listing for any of the contaminants we track. iSpring also claims chlorine from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $116 a year.
0
certified reductions we track
0.1¢
filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the iSpring WGB21B 2-stage whole-house removes
"Certified" means a certifier (NSF, WQA, IAPMO or CSA) lists this exact product for that reduction claim; the listing is linked. "Brand test only" means iSpring cites a lab report but no certifier lists the claim. See certified vs. tested.
| Contaminant | Status | Evidence |
|---|---|---|
| Chlorine | Brand test only | Brand claim (no lab named): "Chlorine (up to 99%), sediment, rust, taste/odor, herbicides, industrial solvents, THMs" |
Not verified, either way (no certification or brand claim): PFAS, Lead, Chloramine, Fluoride, Arsenic, Nitrate, Chromium 6, Mercury, Microplastics, Cysts, VOCs, TDS, Bacteria and viruses, Iron, Copper, Uranium, 1,4-dioxane.
What it costs to run
Yearly cost = replacements per year × filter price, for each filter it uses; a filter is replaced at its gallon rating or its month limit, whichever comes first. Water use: all indoor water (58.6 gallons per person a day).
| Household | Gallons a year | Filters a year | Total a year | Per gallon |
|---|---|---|---|---|
| 1 person | 21,389 | $116 | $116 | 0.5¢ |
| 2 people | 42,778 | $116 | $116 | 0.3¢ |
| 4 people | 85,556 | $116 | $116 | 0.1¢ |
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| F2WGB21B replacement set (FP15B + FC15B) | 50,000 Source note | 6 Source note'Replace the filters every 3-6 months'; system page says up to 12 months ispringfilter.com | $57.99 Source note$57.99, no sale, 2026-10-23 ispringfilter.com |
Specs
- Type
- Whole-house
- Price
- $183
Source note
Compare-at $182.99; sale $173.99 seen 2026-10-23 (store data). ispringfilter.com
- Installation
- Plumber recommended
- Flow rate
- 15 gal/min
Source note
'up to 15 GPM'; 1in NPT. Filters 50,000 gal or 12 months. ispringfilter.com
- Needs power
- No
Where it ranks
Compare the iSpring WGB21B 2-stage whole-house
Common questions
What does the iSpring WGB21B 2-stage whole-house remove?
The iSpring WGB21B 2-stage whole-house has no certifier listing for any of the contaminants we track. iSpring also claims chlorine from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $116 a year.
Does the iSpring WGB21B 2-stage whole-house remove PFAS?
It has no certifier listing or brand claim for PFAS reduction.
How much does the iSpring WGB21B 2-stage whole-house cost to run?
About $116 a year for 2 people ($116 for 1, $116 for 4), counting replacement filters, for all indoor water (58.6 gallons per person a day).
Data checked 2026-10-23. 102 filters tracked.