iSpring WGB32B
#7 in CartridgeFull review
For a larger house on city water that wants more carbon than a two stage system. The three filter set costs more to replace.
Amazon $420$420
The iSpring WGB32B is the better whole-house water filter overall, rated 2.9 to 2.6. The iSpring WGB32B leads on certification. The iSpring WGB32B costs $49.99 less ($420 vs $469.99).
Express Water Essential Pro WH300SCGS-S
#10 in CartridgeFull review
A tidy, frame mounted three stage system for city water with some grit. Its certification claim is vague.
Amazon $469.99$469.99
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 WGB32B 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 WGB32B | Express Water Essential Pro WH300SCGS-S |
|---|---|---|
| Overall rating | 2.9/5 | 2.6/5 |
| Running cost 25% | 35 $1.15 per 1,000 gallons ($114.99 every 100,000 gallons) | 42 $0.96 per 1,000 gallons ($96.36 every 100,000 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 | 100 15 gpm service flow |
| Price 20% | 38 $420 | 32 $469.99 |
| Warranty 15% | 0 1-year warranty | 0 warranty not published, scored as none |
Specifications
| iSpring WGB32B | Express Water Essential Pro WH300SCGS-S | |
|---|---|---|
| Filtration | ||
| Capacity | 100,000 gallons | 100,000 gallons |
| Replacement filters or media | $114.99 | $96.36 |
| Running cost | $1.15 per 1,000 gal | $0.96 per 1,000 gal |
| Stages | 3 | 3 |
| Tested to (not certified) | NSF/ANSI 42 | - |
| Chloramine | No | No |
| PFAS | No | No |
| Build | ||
| Flow | 15 gpm | 15 gpm |
| Ports | 1 in | 1 in |
| UV stage | No | No |
| Warranty | 1 year | - |