Waterdrop WHF3T-PG
#3 in CartridgeFull review
A lower priced three stage big blue system for city water. Running cost is hard to judge without a gallon rating.
Amazon $269.99$269.99
The Waterdrop WHF3T-PG and the iSpring WGB22B are evenly matched, rated 3.2 and 3.1. The Waterdrop WHF3T-PG costs $16.71 less ($269.99 vs $286.70).
iSpring WGB22B
#5 in CartridgeFull review
A sensible upgrade on the WGB21B for a family on chlorinated city water, with filters that last longer and cost little per gallon.
Amazon $286.70$286.70
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.
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 WHF3T-PG | iSpring WGB22B |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Running cost 25% | 50 filter cost or capacity not published (neutral score used) | 47 $0.83 per 1,000 gallons ($82.97 every 100,000 gallons) |
| Certification 25% | 30 tested to NSF/ANSI 42, not certified | 30 tested to NSF/ANSI 42, not certified |
| Flow 15% | 100 15 gpm service flow | 100 15 gpm service flow |
| Price 20% | 65 $269.99 | 61 $286.70 |
| Warranty 15% | 0 warranty not published, scored as none | 0 1-year warranty |
Specifications
| Waterdrop WHF3T-PG | iSpring WGB22B | |
|---|---|---|
| Filtration | ||
| Capacity | - | 100,000 gallons |
| Replacement filters or media | - | $82.97 |
| Running cost | - | $0.83 per 1,000 gal |
| Stages | 3 | 2 |
| Tested to (not certified) | NSF/ANSI 42 | 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 |