Waterdrop · Under-sink reverse osmosis
Waterdrop D6: what it removes and what it costs
Model: WD-D6-B-MZ (D6 with external remineralization filter); filter WD-D6RF
The Waterdrop D6 has no certifier listing for any of the contaminants we track. Waterdrop also claims PFAS, lead, chlorine and fluoride from lab tests that are not certification.
0
certified reductions we track
—
filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the Waterdrop D6 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): Chloramine, Chromium 6, Mercury, Microplastics, VOCs, 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, plus the water sent to the drain at an average water and sewer price. 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 | Drain water | Total a year | Per gallon |
|---|---|---|---|---|---|
| 1 person | 102 | — | 51 gal ($1) | — | — |
| 2 people | 204 | — | 102 gal ($2) | — | — |
| 4 people | 409 | — | 204 gal ($4) | — | — |
Rated production is 600 gallons a day; 2 people need about 0.56 — well within it. Colder water and lower pressure reduce actual output.
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| WD-D6RF 5-in-1 composite (PP, carbon block, PP, RO, post carbon) | 1,000 Source noteBrand: 12 months or 1,000 gallons waterdropfilter.com | 12 Source note | $99.99 Source note |
| External remineralization filter (model not named on brand page) | — | — Source noteNot stated | — Source noteModel not identified on D6-MZ page |
Specs
- Type
- Under-sink reverse osmosis
- Price
- $427
Source note
Brand list price for D6-MZ, sold out 2026-10-23 waterdropfilter.com
- Installation
- DIY (under-sink or inline fittings)
- Rated production
- 600 gallons per day
Source note
- Pure to drain
- 2:1
Source note
Product text says 2:1; brand comparison table on the same page shows 1.5:1 waterdropfilter.com
- Flow rate
- 0.42 gal/min
Source note
Filter page flow rate waterdropfilter.com
- Needs power
- Yes
- Remineralization
- Yes
Compare the Waterdrop D6
Common questions
What does the Waterdrop D6 remove?
The Waterdrop D6 has no certifier listing for any of the contaminants we track. Waterdrop also claims PFAS, lead, chlorine and fluoride from lab tests that are not certification.
Does the Waterdrop D6 remove PFAS?
Waterdrop claims PFAS reduction from lab tests by Waterdrop (brand claim, no tester named), but there is no certifier listing for it.
Data checked 2026-10-23. 102 filters tracked.