Waterdrop · Countertop filter
Waterdrop King Tank gravity filter (2.25 gal): what it removes and what it costs
Model: Waterdrop King Tank WD-TK, 2.25-gallon stainless gravity system with 2 WD-BB9 black carbon filters (WD-TK-F-D adds 2 fluoride filters; WD-TK-S with stand)
The Waterdrop King Tank gravity filter (2.25 gal) has no certifier listing for any of the contaminants we track. Waterdrop also claims chlorine and fluoride from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $3 a year.
0
certified reductions we track
1.3¢
filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the Waterdrop King Tank gravity filter (2.25 gal) removes
"Certified" means a certifier (NSF, WQA, IAPMO or CSA) lists this exact product for that reduction claim; the listing is linked. "Brand test only" means Waterdrop cites a lab report but no certifier lists the claim. See certified vs. tested.
Not verified, either way (no certification or brand claim): PFAS, Lead, Chloramine, Arsenic, Nitrate, Chromium 6, Mercury, Microplastics, Cysts, VOCs, TDS, Bacteria and viruses, Iron, Copper, Uranium, 1,4-dioxane.
What it costs to run
Yearly cost = replacements per year × filter price, for each filter it uses; a filter is replaced at its gallon rating or its month limit, whichever comes first. Water use: drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
| Household | Gallons a year | Filters a year | Total a year | Per gallon |
|---|---|---|---|---|
| 1 person | 102 | $1 | $1 | 1.3¢ |
| 2 people | 204 | $3 | $3 | 1.3¢ |
| 4 people | 409 | $5 | $5 | 1.3¢ |
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| Waterdrop WD-BB9 black filter (pair) | 6,000 Source noteBrand: the two carbon filters purify up to 6,000 gallons; actual life depends on water quality waterdropfilter.com | — | $78.99 Source note2-pack $78.99 ($39.49 each); 4-pack $111.99 on waterdropfilter.com 2026-10-23 waterdropfilter.com |
Specs
- Type
- Countertop filter
- Price
- $230
Source note
waterdropfilter.com 2026-10-23 (2 black filters); with 2 fluoride filters $259.99; with stand $270.99. No compare-at shown. waterdropfilter.com
- Installation
- None
- Capacity
- 2.25 gal
Source note
2.25-gallon capacity per brand page waterdropfilter.com
- Needs power
- No
Compare the Waterdrop King Tank gravity filter (2.25 gal)
Common questions
What does the Waterdrop King Tank gravity filter (2.25 gal) remove?
The Waterdrop King Tank gravity filter (2.25 gal) has no certifier listing for any of the contaminants we track. Waterdrop also claims chlorine and fluoride from lab tests that are not certification. For 2 people drinking and cooking with it, replacement filters cost about $3 a year.
Does the Waterdrop King Tank gravity filter (2.25 gal) remove PFAS?
It has no certifier listing or brand claim for PFAS reduction.
How much does the Waterdrop King Tank gravity filter (2.25 gal) cost to run?
About $3 a year for 2 people ($1 for 1, $5 for 4), counting replacement filters, for drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
Data checked 2026-10-23. 102 filters tracked.