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
The Purewell SF-2.25G PFAS-Free 6-Stage is the better gravity water filter overall, rated 3.2 to 3.0. The Purewell SF-2.25G PFAS-Free 6-Stage leads on certification. The Purewell SF-2.25G PFAS-Free 6-Stage costs $21 less ($168.99 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 SF-2.25G PFAS-Free 6-Stage for certification (states certification to NSF/ANSI 42 vs no certification or test claim published).
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 SF-2.25G PFAS-Free 6-Stage | Waterdrop TK-AE |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 25% | 75 $75.11 per gallon of capacity ($168.99, 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% | 30 states certification to NSF/ANSI 42 | 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 SF-2.25G PFAS-Free 6-Stage | Waterdrop TK-AE | |
|---|---|---|
| Capacity and flow | ||
| Tank capacity | 2.2 gal | 2.2 gal |
| Price per gallon of capacity | $75.11 | $84.44 |
| Elements included | - | 3 |
| Maximum elements | - | 3 |
| Filtration | ||
| Element type | 6-stage filter: mesh, PP cotton, carbon, KDF and silver ions (ZeroWater-compatible) | Coconut shell carbon filter (black) |
| Certified | NSF/ANSI 42 | None stated |
| Certification detail | Listing: IAPMO certified to reduce Total PFAS, lead, chlorine and mercury; the filter is NSF/ANSI 42 certified. Does not reduce TDS. | 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 | - |
| Weight | 7.7 lb | - |
| Warranty | - | 1 year |