3M Aqua-Pure AP904
#6 in CartridgeFull review
The AP903 with scale inhibitor added, for city water that is both chlorinated and hard.
Amazon $421.18$421.18
2.9/5
A bare bones single filter housing for sediment and chlorine taste at the lowest price. It suits small budgets and light use.
- $0.90 per 1,000 galRunning cost
- 30,000 gallonsCapacity
Check price at Amazon$69.85
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Costs well under $100 with a 1 in housing
- Clear sump shows when the filter is dirty
- Takes cheap, easy to find GE filters
Cons
- Small filters need changing every three months
- No published flow rating or warranty
- Its NSF claim names no standard and is not in the NSF registry
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its build. How we rank explains each one.
Specifications
| Model number | GXWH40L |
|---|---|
| Filtration | |
| Capacity | 30,000 gallons |
| Replacement filters or media | $26.94 |
| Running cost | $0.90 per 1,000 gal |
| Stages | 1 |
| Chloramine | No |
| PFAS | No |
| Build | |
| Ports | 1 in |
| UV stage | No |
Alternatives in this build
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
iSpring WGB32B-KSNC
#9 in CartridgeFull review
For homes on chloramine treated city water that want cartridges rather than a tank. Check replacement filter prices before buying.
Amazon $639.99$639.99
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