Purewell 2.25G 3-Stage Window
The 3-stage Purewell with a water-level window. It costs a little more than the certified PW-OB.
Amazon $158.99$158.99
The Purewell 2.25G 3-Stage Window and the Waterdrop TK-AE are evenly matched, rated 3.1 and 3.0. The Purewell 2.25G 3-Stage Window leads on value. The Purewell 2.25G 3-Stage Window costs $31 less ($158.99 vs $189.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
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
Which should you buy?
- Choose the Purewell 2.25G 3-Stage Window for value ($70.66 per gallon of capacity ($158.99, 2.2 gal) vs $84.44 per gallon of capacity ($189.99, 2.2 gal)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 2.25 gal gravity water filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Purewell 2.25G 3-Stage Window | Waterdrop TK-AE |
|---|---|---|
| Overall rating | 3.1/5 | 3.0/5 |
| Value 25% | 79 $70.66 per gallon of capacity ($158.99, 2.2 gal) | 67 $84.44 per gallon of capacity ($189.99, 2.2 gal) |
| Running cost 15% | 50 replacement cost or element life not published (neutral score used) | 50 replacement cost or element life not published (neutral score used) |
| Capacity 15% | 17 2.2 gal tank | 17 2.2 gal tank |
| Certification 20% | 0 no certification or test claim published | 0 no certification or test claim published |
| Element life 15% | 100 3,000 gal rated per element | 100 3,000 gal rated per element |
| Warranty 10% | 0 warranty not published, scored as none | 11 1-year warranty |
Specifications
| Purewell 2.25G 3-Stage Window | Waterdrop TK-AE | |
|---|---|---|
| Capacity and flow | ||
| Tank capacity | 2.2 gal | 2.2 gal |
| Price per gallon of capacity | $70.66 | $84.44 |
| Elements included | 2 | 3 |
| Maximum elements | 2 | 3 |
| Flow, as shipped | 4 gal/hr | - |
| Filtration | ||
| Element type | Black carbon composite: 0.01 micron UF membrane, silver ion membrane and carbon block | Coconut shell carbon filter (black) |
| Certified | None stated | None stated |
| Certification detail | Listing makes no certification claim for this model. | Listing makes no certification claim for this three-filter model. |
| Running cost | ||
| Rated life per element | 3,000 gal each | 3,000 gal each |
| Build | ||
| Material | 304 stainless steel | 304 stainless steel |
| Height | 20 in | - |
| Diameter | 8.8 in | - |
| Warranty | - | 1 year |