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 $155.15$155.15
The iSpring WGB21B is the better whole-house water filter overall, rated 3.4 to 3.0. The iSpring WGB21B leads on running cost and price. The GE GXWH70M Smart wins on certification. The iSpring WGB21B costs $39.50 less ($155.15 vs $194.65).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
GE GXWH70M Smart
#7 in CartridgeFull review
A single filter for chlorine taste with a built in leak detector and shutoff. Worth it if the leak protection is what you want.
Amazon $194.65$194.65
Which should you buy?
- Choose the iSpring WGB21B for running cost ($0.90 per 1,000 gallons ($45.11 every 50,000 gallons) vs $1.93 per 1,000 gallons ($28.98 every 15,000 gallons)) and price ($155.15 vs $194.65).
- Choose the GE GXWH70M Smart for certification (certified to NSF/ANSI 42 vs tested to NSF/ANSI 42, not certified).
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 GXWH70M Smart |
|---|---|---|
| Overall rating | 3.4/5 | 3.0/5 |
| Running cost 25% | 44 $0.90 per 1,000 gallons ($45.11 every 50,000 gallons) | 16 $1.93 per 1,000 gallons ($28.98 every 15,000 gallons) |
| Certification 25% | 30 tested to NSF/ANSI 42, not certified | 60 certified to NSF/ANSI 42 |
| Flow 15% | 100 15 gpm service flow | 50 flow not published (neutral score used) |
| Price 20% | 98 $155.15 | 84 $194.65 |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
Specifications
| iSpring WGB21B | GE GXWH70M Smart | |
|---|---|---|
| Filtration | ||
| Capacity | 50,000 gallons | 15,000 gallons |
| Replacement filters or media | $45.11 | $28.98 |
| Running cost | $0.90 per 1,000 gal | $1.93 per 1,000 gal |
| Stages | 2 | 1 |
| Certified | - | NSF/ANSI 42 |
| Tested to (not certified) | NSF/ANSI 42 | - |
| Chloramine | No | No |
| PFAS | No | No |
| Build | ||
| Flow | 15 gpm | - |
| Ports | 1 in | 0.8 in |
| UV stage | No | No |
| Warranty | 1 year | 1 year |