Waterdrop WHF21-PG
#1 in CartridgeFull review
A low cost starter system for chlorinated city water in a small home.
Amazon $106.98$106.98
The Waterdrop WHF21-PG is the better whole-house water filter overall, rated 3.4 to 2.9. The Waterdrop WHF21-PG leads on certification. The GE GXWH40L costs $37.13 less ($69.85 vs $106.98).
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 Waterdrop WHF21-PG 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 | Waterdrop WHF21-PG | GE GXWH40L |
|---|---|---|
| Overall rating | 3.4/5 | 2.9/5 |
| Running cost 25% | 50 filter cost or capacity not published (neutral score used) | 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% | 100 $106.98 | 100 $69.85 |
| Warranty 15% | 0 1-year warranty | 0 warranty not published, scored as none |
Specifications
| Waterdrop WHF21-PG | GE GXWH40L | |
|---|---|---|
| Filtration | ||
| Capacity | - | 30,000 gallons |
| Replacement filters or media | - | $26.94 |
| Running cost | - | $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 | - |