iSpring WGB21B
#2 in CartridgeFull review
A low cost first whole-house filter for city water with chlorine taste. Expect to change filters several times a year.
Amazon $155.99$155.99
The iSpring WGB21B is the better whole-house water filter overall, rated 3.4 to 2.9. The iSpring WGB21B leads on certification. The GE GXWH40L costs $86.14 less ($69.85 vs $155.99).
GE GXWH40L
#8 in CartridgeFull review
A bare bones single filter housing for sediment and chlorine taste at the lowest price. It suits small budgets and light use.
Amazon $69.85$69.85
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the iSpring WGB21B for certification (tested to NSF/ANSI 42, not certified vs no certification in a public listing, no tested to claim).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every cartridge whole-house water filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | iSpring WGB21B | GE GXWH40L |
|---|---|---|
| Overall rating | 3.4/5 | 2.9/5 |
| Running cost 25% | 44 $0.90 per 1,000 gallons ($45.11 every 50,000 gallons) | 45 $0.90 per 1,000 gallons ($26.94 every 30,000 gallons) |
| Certification 25% | 30 tested to NSF/ANSI 42, not certified | 0 no certification in a public listing, no tested to claim |
| Flow 15% | 100 15 gpm service flow | 50 flow not published (neutral score used) |
| Price 20% | 98 $155.99 | 100 $69.85 |
| Warranty 15% | 0 1-year warranty | 0 warranty not published, scored as none |
Specifications
| iSpring WGB21B | GE GXWH40L | |
|---|---|---|
| Filtration | ||
| Capacity | 50,000 gallons | 30,000 gallons |
| Replacement filters or media | $45.11 | $26.94 |
| Running cost | $0.90 per 1,000 gal | $0.90 per 1,000 gal |
| Stages | 2 | 1 |
| Tested to (not certified) | NSF/ANSI 42 | - |
| Chloramine | No | No |
| PFAS | No | No |
| Build | ||
| Flow | 15 gpm | - |
| Ports | 1 in | 1 in |
| UV stage | No | No |
| Warranty | 1 year | - |