Purewell SF-2.25G PFAS-Free 6-Stage
The Purewell to pick when PFAS and lead are the concern. It uses a different filter than the other Purewells.
Amazon $168.99$168.99
2.2 galNSF/ANSI 423,000 gal each
3.1/5
The 3-stage Purewell with a water-level window. It costs a little more than the certified PW-OB.
- 2.2 galCapacity
- None statedCertification
- 3,000 gal eachElement life
Check price at Amazon$158.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Clear window shows the water level without opening the lid
- Listed at 4 gal/hr
Cons
- Listing makes no certification claim
- Listing publishes no warranty
The Purewell 2.25G window family
Every Purewell 2.25G window model we rank, smallest first. Ratings compare each against its own capacity.
| Model | Capacity | Rating | Price |
|---|---|---|---|
| Purewell 2.25G 3-Stage Window (this one) | 2.2 gal | 3.1/5 | $158.99 |
| Purewell 2.25G 8-Stage Fluoride | 2.2 gal | 2.9/5 | $229 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its capacity. How we rank explains each one.
Specifications
| Model number | PW-KS |
|---|---|
| Capacity and flow | |
| Tank capacity | 2.2 gal |
| Price per gallon of capacity | $70.66 |
| Elements included | 2 |
| Maximum elements | 2 |
| Flow, as shipped | 4 gal/hr |
| Filtration | |
| Element type | Black carbon composite: 0.01 micron UF membrane, silver ion membrane and carbon block |
| Certified | None stated |
| Certification detail | Listing makes no certification claim for this model. |
| Running cost | |
| Rated life per element | 3,000 gal each |
| Build | |
| Material | 304 stainless steel |
| Height | 20 in |
| Diameter | 8.8 in |
Alternatives in this capacity
Culligan MaxClear Scout 2 Filters
The Scout with its full set of two filters. Buy this one if you will fill the tank daily.
Amazon $199$199
2.2 galNSF/ANSI 42
Waterdrop TK-AE
#10 in Up to 2.25 galFull review
For people who want faster flow than a two-filter 2.25 gal system and can do without a certification claim.
Amazon $189.99$189.99
2.2 galNone stated3,000 gal each
Compare
Compare the Purewell 2.25G 3-Stage Window with any other gravity water filter →
More from Purewell: every Purewell product ranked.