Waterdrop WD-D6-B Water Filtration System
- Capacity: 600 gallons
- Purification Method: Reverse Osmosis
- Installation Type: Under-Sink
- Supported Water Tds Level Maximum Ppm: 2000
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An under-sink reverse osmosis system rated for 600 gallons of filter life, suited to a permanent install rather than a portable pitcher swap.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B08746G2XXModel: WD-D6Category: Water Filtration Systems
Overview
The Waterdrop WD-D6-B is an under-sink reverse osmosis filtration system rated for 600 gallons, sized 15.98 x 5.98 x 11.97 inches for install below the sink.
Unlike the countertop RO unit in this category, the WD-D6-B is built for under-sink installation, plumbed into the cold water line rather than filled by hand. The 600 gallon rating describes filter capacity before a change is due, the figure to track against household water use rather than a fixed time period.
- Reverse osmosis purification
- 600 gallon filter rating
- Under-sink install type
- 15.98 x 5.98 x 11.97 in footprint
Who it's for
Fits a kitchen where under-sink space and a cold water line connection are available and reverse osmosis filtration is the goal. Not for renters or anyone who wants a filter with no plumbing modification, since this is an install, not a countertop pour-through.
Pros and cons
- 600 gallon rated filter life
- Reverse osmosis filtration under the sink
- Frees up counter space entirely
- Requires plumbing install, not plug and play
- Needs 15.98 x 5.98 x 11.97 in of cabinet space
Performance notes
Water is pushed through a reverse osmosis membrane under the sink, with the 600 gallon rating marking the expected filter capacity before replacement is due. At 15.98 x 5.98 x 11.97 inches it needs dedicated cabinet space rather than sitting loose under the sink.
Specifications
| Brand | Waterdrop |
|---|---|
| Model | WD-D6 |
| Dimensions & fit | |
| Item Dimensions L X W X H | 16 × 6 × 12 inches |
| Capacity & performance | |
| Capacity | 600 gallonshigher than 89% of 46 water filtration systems |
| Upper Temperature Rating | 100 °F |
| Maximum Flow Rate | 0.4 gpm |
| Lowertemperature Range | 41 °F |
| Operating Pressure Range | 14 psi |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Material Type | Reverse Osmosis Membrane & Carbon Block & PP Cotton |
| Compatibility & installation | |
| Installation Type | Under-Sink |
| Included components | |
| Unit Count | 1 |
| Included Components | D6 RO System(with 1 Pre-Installed Filters), Smart Faucet, User Manual |
| Warranty & support | |
| Supported Water Tds Level Maximum Ppm | 2000 |
| Warranty Description | 1 year |
| Other details | |
| Purification Method | Reverse Osmosis |
| Container Type | Cartridge |
| Number Of Items | 1 |
| Other Special Features Of The Product | Tankless |
| Part Number | WD-D6-B |
| Item Highlight | 6-Stage Filtration, RO System, 2:1 Pure To Drain, Smart LED Faucet, Easy Installation, Save Space, Require Electrical Outlet |
| Manufacture Year | 2021 |
Closest rivals on specs
Bluevua RO100ROPOT Travel Water Filtration System- Capacity 600 vs 528.3 gallons (+14%)
iSpring RO500AK Alkaline Reverse Osmosis System- Capacity 600 vs 500 gallons (+20%)
iSpring RCC1UP-AK Reverse Osmosis System 100 GPD- Capacity 600 vs 100 gallons (+500%)
Frequently asked questions
Is the WD-D6-B a countertop or under-sink unit?
It's built for under-sink installation.
How long does the filter last?
It's rated for 600 gallons before a change is due.
What size cabinet space does it need?
15.98 x 5.98 x 11.97 inches.