Waterdrop TK-FS
The Waterdrop with fluoride filters in the box. Costs $80 more than the TK-A, which can take fluoride filters as an add-on.
Amazon $239.99$239.99
2.2 galNSF/ANSI 42, NSF/ANSI 3723,000 gal each
3.2/5
The Purewell to pick when PFAS and lead are the concern. It uses a different filter than the other Purewells.
- 2.2 galCapacity
- NSF/ANSI 42Certification
- 3,000 gal eachElement life
Check price at Amazon$168.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- IAPMO certification for lead and Total PFAS reduction, per the listing
- Uses ZeroWater-compatible filters
Cons
- Not compatible with Berkey-style elements
- Listing does not say how many filters ship
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 | SF-2.25G |
|---|---|
| Capacity and flow | |
| Tank capacity | 2.2 gal |
| Price per gallon of capacity | $75.11 |
| Filtration | |
| Element type | 6-stage filter: mesh, PP cotton, carbon, KDF and silver ions (ZeroWater-compatible) |
| Certified | NSF/ANSI 42 |
| Certification detail | Listing: IAPMO certified to reduce Total PFAS, lead, chlorine and mercury; the filter is NSF/ANSI 42 certified. Does not reduce TDS. |
| Running cost | |
| Rated life per element | 3,000 gal each |
| Build | |
| Material | 304 stainless steel |
| Height | 20 in |
| Diameter | 8.8 in |
| Weight | 7.7 lb |
Alternatives in this capacity
Waterdrop TK-AB-FS
A cheaper way to get fluoride filters in the box than the TK-FS, with silver in the carbon filters.
Amazon $199.99$199.99
2.2 galNSF/ANSI 42, NSF/ANSI 3723,000 gal each
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
Compare
Compare the Purewell SF-2.25G PFAS-Free 6-Stage with any other gravity water filter →
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