.blocks-item-opposite img { width: 100%; } .wd-pure-to-drain-rate-box { position: relative; display: inline; cursor: pointer; } .wd-pure-to-drain-rate-hover { width: 14px; } .wd-pure-to-drain-rate { text-align: left; width: 375px; height: 145px; position: absolute; top: -153px; left: -13px; display: none; background: white; color: #000000; font-size: 14px; line-height: 21px; font-weight: 400; padding: 20px; box-sizing: border-box; border-radius: 5px; box-shadow: 0 0 2px 1px rgb(241, 239, 239); } .wd-pure-to-drain-rate-box:hover .wd-pure-to-drain-rate { display: block; } .wd-pure-to-drain-rate-three { position: absolute; width: 0px; height: 0px; border-width: 10px; border-style: solid; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 145px; left: 10px; } .wd-pure-to-drain-rate-three-bottom { position: absolute; width: 0px; height: 0px; border-width: 10px; border-style: solid; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 144px; left: 10px; } @media screen and (max-width: 1024px) { .wd-pure-to-drain-rate { width: 350px; height: 125px; top: -135px; left: -13px; font-size: 14px; line-height: 20px; padding: 13px; } .wd-pure-to-drain-rate-three { border-width: 10px; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 126px; left: 10px; } .wd-pure-to-drain-rate-three-bottom { border-width: 10px; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 125px; left: 10px; } } @media screen and (max-width: 768px) { .wd-pure-to-drain-rate { width: 350px; height: 125px; top: -135px; left: -13px; font-size: 14px; line-height: 20px; padding: 13px; } .wd-pure-to-drain-rate-three { border-width: 10px; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 126px; left: 10px; } .wd-pure-to-drain-rate-three-bottom { border-width: 10px; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 125px; left: 10px; } } @media screen and (max-width: 470px) { .wd-pure-to-drain-rate { width: 350px; height: 125px; top: -135px; left: -80px; font-size: 14px; line-height: 20px; padding: 13px; } .wd-pure-to-drain-rate-three { border-width: 10px; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 126px; left: 77px; } .wd-pure-to-drain-rate-three-bottom { border-width: 10px; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 125px; left: 77px; } } @media screen and (max-width: 425px) { .wd-pure-to-drain-rate { width: 332px; height: 117px; top: -126px; left: -80px; font-size: 14px; line-height: 20px; padding: 7px; } .wd-pure-to-drain-rate-three { border-width: 10px; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 117px; left: 76px; } .wd-pure-to-drain-rate-three-bottom { border-width: 10px; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 116px; left: 76px; } } @media screen and (max-width: 375px) { .wd-pure-to-drain-rate { width: 276px; height: 117px; top: -126px; left: -80px; font-size: 14px; line-height: 17px; padding: 7px; } .wd-pure-to-drain-rate-three { border-width: 10px; border-color: rgb(240, 240, 240) transparent transparent transparent; top: 117px; left: 76px; } .wd-pure-to-drain-rate-three-bottom { border-width: 10px; border-color: rgb(255, 255, 255) transparent transparent transparent; top: 116px; left: 76px; } }
Model number
WD-D4-W
Product dimensions
16.02 x 6.22 x 12.44 inches
Rated voltage/ Frequency
110-120V/ 60HZ
Rated power
65W
Service flow rate
0.28 gal/min
Feed water pressure
14.5-87 psi
Feed water requirement
Municipal tap water
How does reverse osmosis system work?
Water passes through the semipermeable membrane under pressure. This leads to the separation of the impurities from the water molecules. The impurities are on one side of the membrane, and the water molecules on the other, with the clean water going to your tap without any impurity whatsoever. There are several filtration stages in the RO water filtration process – up to seven sometimes, and these are responsible for the high purity of water.
What are the advantages of Waterdrop reverse osmosis systems?
You only need limited space to install this tankless reverse osmosis system. Its optimized filtration performance means it reduces heavy metals, chlorine, and even TDS. This system packs a powerful filtration performance and an ultra-extended service life despite having a single composite filter.
With just one filter replacement all year long, this Waterdrop reverse osmosis water filter will serve you with maximum convenience.
Can I drink reverse osmosis water everyday?
What is the flow rate of this reverse osmosis water filtration system?
Does Waterdrop whole house reverse osmosis waste a lot of water?
How to install the reverse osmosis home system?
How long does a reverse osmosis filter last?
When to replace the filters of this reverse osmosis system?
Can I connect a water softener with this reverse osmosis system?
b. If a salt-based water softener is installed BEFORE the RO unit:
-The filtered water could be salty since our unit can only remove 90% salt added by the softener.
-The RO filter’s lifetime could be shortened due to the unusual amount of sodium in the source water, which is NOT covered by the warranty.
-We have already put a clear warning on the product page regarding this aspect.
c. If your water softener is NOT salt-based, then our RO unit should work properly with it.
Can I use this reverse osmosis system in my RV?
Now you can stop using the dirty and unsafe water from campgrounds. This filter system ensures you get clean and pure water for drinking directly from your taps and shower. You are also immune to the common health issues associated with contaminated water, which may prevent you from enjoying your road trip.
Is this reverse osmosis water filtration system suitable for well water?
The reasons are as follows:
1. Large particles.
Compared to municipal tap water, the well water is rich of large particles, which will clog the filters easily, and shorten their lifetime significantly.Please note that the filters will still need to be replaced more frequently, even if you have added a pre-filtration system.
2. Composition
The well water has very complicated compostion, and some of them (apart from the large particles) can cause the filter or internal valve to be clogged and prevent the RO system from normal performance.
3. Water pressure
The well water may not provide the feed water pressure that the RO system requires (14.5 psi min.). Furthermore, the water pressure will be even lower after passing through pre-filtration systems.
Do I need to have an electrical outlet under my sink for this work?
Can I connect the remineralization filter with this reverse osmosis water filter?
What does Pure to Drain Rate mean?










![]() D4 RO Filtration System
| ![]() D6 RO Filtration System
| ![]() G3P800 RO Filtration System
| ![]() G3 RO Filtration System
| ![]() G2P600 RO Filtration System
| ![]() G2MNR RO Filtration System
| |
Need Installation | √ | √ | √ | √ | √ | √ |
---|---|---|---|---|---|---|
Beneficial Minerals | × | × | × | × | × | √ |
Flow Rate | 400 GPD | 600 GPD | 800 GPD | 400 GPD | 600 GPD | 400 GPD |
Pure to Drain Rate![]() Drain ratio stands for the ratio of wastewater and purified water dispensed by a RO system. For example, the 3:1 drain ratio means it uses up a gallon of wastewater for every 3 gallons of pure water you get. | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
Faucet | Ordinary faucet | Smart faucet | Smart faucet | Smart faucet | Ordinary faucet | Ordinary faucet |
Display | Filter lifespan | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan | Filter lifespan |
Self-clean | √ | √ | √ | √ | × | × |
Holiday mode | × | √ | √ | √ | × | × |
Electricity Required | √ | √ | √ | √ | √ | √ |
Filter Cartridges | WD-D4RF | WD-D6RF | WD-G3-N1CF | WD-G3-N1CF | WD-G2CF | WD-MNR35 |
Noise(≤) | 55dB | 55dB | 65dB | 65dB | 55dB | 55dB |
Filter Lifespan | 12 Mths | 12 Mths | CF-6 Mths CB-12 Mths RO-24 Mths | CF-6 Mths CB-12 Mths RO-24 Mths | CF-12 Mths P6MRO-24 Mths | MNR-12 Mths CF-12 Mths MRO-24 Mths |
Dimensions(inch) | 16.02*6.22*12.44 | 15.98*5.98*11.97 | 18.11*5.67*17.72 | 18.11*5.67*17.72 | 17.32*5.91*13.9 | 17.32*5.91*13.9 |

- The reverse osmosis filter has a 1-year service life, protecting you from water hazards for the entire year.
- You can replace the water filter in 3 seconds with a single twist. No tools are required.

- An excellent add-on Remineralization filter adopts 18 natural materials to restore minerals.
- Saves 8300 single-used bottles and $12600 spent on bottled mineral water.
- Compatible with RO water system, undersink filtration systems and refrigerator.
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