Waterdrop K19-SFK Countertop RO review
By Daryna Klochko · Published · Specs checked Oct 13, 2026 · 
Scores 9.25/10, tied for 5th of the 7 countertop filters we track. At $349 it costs the same as the category median of $349. Its cartridge cost of about $79 a year is below the $130-a-year median of the 7 countertop filters with a stated cartridge cost.
You need a certified health claim: its listing covers TDS only, unlike 5 of the 7 countertop filters
- Price
- $349
- Certified for
- TDS
- Flow
- Not stated
- Cartridge life
- 1,100 gal claimed
- Cost per year
- $79
- Warranty
- 1 year
Certification
Listed by IAPMO under NSF/ANSI 58 for TDS, checked Oct 13, 2026. Waterdrop also claims 6 more substances that are not in the listing. Search the IAPMO listings
- TDS
Waterdrop also claims Chlorine, Chloramine, Lead, PFOA/PFOS, Arsenic, Fluoride: brand claims, not in a certifier listing.
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 13, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 13, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
Warranty: 1 year. Returns: 30 days. Shipping: not stated by the brand. Source: waterdropfilter.com, checked Oct 13, 2026.
Source: waterdropfilter.com, checked Oct 13, 2026.
Compared with similar countertop filters
All 7 countertop filters →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Brondell Cypress H630 Countertop | $194.99 | Cysts · VOCs +2 | $150 | 1 year limited | 9.25/10 | Check price → |
| Waterdrop K19-SFK Countertop ROTHIS MODEL | $349 | TDS | $79 | 1 year | 9.25/10 | Check price → |
| AquaTru Carafe Countertop RO | $375 | Lead · Cysts +9 | $130 | 1 year | 9.75/10 | Check price → |
| Aquasana Clean Water Machine (AQ-CWM2) | $399.99 | Lead · Cysts +5 | $73 | 1 year | 9.75/10 | Check price → |
| AquaTru Classic Countertop RO | $475 | Lead · Cysts +9 | $130 | 1 year | 9.75/10 | Check price → |