Model number
WD-G2-B/WD-G2-W
Item weight
20.94 pounds
Materials
System cover: BPA-free plastic
Faucet: metal
MRO filter: reverse osmosis membrane & activated carbon block
CF filter: sediment PP membrane & activated carbon block
Power cord length
59 inches
Product dimensions
17.7×5.9×13.9 inches
Item Model Number
WD-G2-B/WD-G2-W
Color
White & Black
Components Included
System cover, MRO filter, CF filter, brushed nickel faucet, feed water adapter, PE tubing *3 ( 60" ), drain saddle, lock clips, teflon tape, main power cable ( 59" )
Flow rate
400 gallons per day (GPD)
Indoor or outdoor use
Indoor use only
Usage conditions
Ice machines, Faucets, Aquariums, RVs, Well water
*If you use well water as the source, please ensure that the feed water is pre-filtered.
An electrical outlet is required to operate the RO system.
Reduction substances:
TDS, chlorine, taste and odor, chloramine, scale, turbidity.
Carcinogens: chromium (hexavalent), chromium (trivalent), cadmium and cadmium compounds, ferric oxide.
Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum.
Microorganic contaminants: cysts.
Inorganic pollutants: arsenic and inorganic arsenic compounds, fluoride.
Organic pollutants: asbestos, benzene, formaldehyde, trichloromethane, chlordane, PFOA & PFOS, etc.
Waterdrop G2 tankless reverse osmosis water filtration system, one
of the latest products launched last year, is a water filter system
dedicated to meet your urgent need for good contamination reduction
rate with a fast water flow. RO, the abbreviation of reverse
osmosis, is a “superstar” technology employed in water purification
systems, where partially permeable membrane is used. And we are
striving for excellence to deliver the right water purifier for you.
We have a series of drinking water filtration system. Let me tell
you why choosing Waterdrop tankless reverse osmosis system is a wise
decision you will make!
For decades, we drink water directly from the faucet with no
awareness of the fact that some substances in taping water are
harmful to our health. Lead, for a start, is a toxic metal that
comes from the pipe lines in almost every American household.
Drinking lead-tainted water can lead to many problems. Once
absorbed, lead will be stored in our bones as a continual internal
exposure, waiting to be released as our bones demineralize. This may
result in people getting possible health risks like high blood
pressure, cardiovascular diseases. Children under age 3 is extremely
vulnerable to it. Luckily, our ro water purifier is NSF 372
certified for lead-free material, effectively cutting off lead
exposure from root. The system also got NSF 58 claim to reduce over
90% of TDS after complete flushing, another main impurity we aim to
conquer. TDS, standing for total dissolved solid, effects taste and
odor of water if its level is exceedingly high. Removing TDS can
give you a pure water free from unpleasant taste and odor. This is
the reverse osmosis system you can ever have!
Besides all the certifications, Waterdrop tankless RO system uses
composite ro water filter. This original move brings about excellent
performance in filtration. The five-stage filtration of the home
reverse osmosis water filtration system is achieved by combining
multiple under sink water filter materials into the whole undersink
water filter.
Water first goes through a pre-sediment PP membrane and a carbon
block filter. The high-precision activated carbon block is made from
natural coconut shell, the pore of the activated carbon block in
which is much higher than that in other forms. After running through
another sediment membrane for additional impurities rejection, water
will face a reverse osmosis membrane, to reduce 90% of TDS and most
heavy metals like arsenic and mercury. The efficiency equals more
than three stages of filtration. Using ro membrane will give you an
extra benefit—you don’t have to replace filters that frequently! The
reverse osmosis filter can bring you so much convenience! With the
last step of filtration through a secondary activated carbon block
finished—mission accomplished! Any particles larger than 0.0001 μm
will be filtered out. Most contaminants are blocked outside. There,
a cup of water that is pure, healthy, absent of taste, odor and
color is right in front of you.
This is what we give you—the reverse osmosis water. Bon appetit! Get
you a water filtration system for home because this is the home
water filter using the ro filter!
Waterdrop G2 RO system is an all-in-one, intelligent water
purification system with many innovative designs. Our under sink
reverse osmosis is designed to be tankless, leaving out the gigantic
and ugly reverse osmosis water tanks used often in conventional
water treatment systems. And this smaller and more compact reverse
osmosis system can be easily put under the sink while saving more
storage than its conventional counterparts, and this new water
filter reverse osmosis also helps you avoid secondary pollution.
This is the water filter systems for home! This tankless reverse
osmosis water filtration ranks high on the home water filtration
system list. Another innovative design is the internal pump, which
is used for raising water pressure, and with the application of
composite filter elements, the water flow of the under-sink water
filter can reach to 400 GPD (gallons per day). This literally means
you can get a cup of filtered water in just 12 seconds. The
traditional RO system, however, filters water more slowly and stores
water in the reverse osmosis tank, which may cause secondary
contamination and therefore cannot meet the goal of producing
purified water. This quick water purification process and tankless
design meet the need of your whole family and even small companies
for a purer ro water.
Besides this, Waterdrop RO system is environmentally friendly, as it
saves water waste by 300% compared with traditional home water
filtration system. The waste water ratio is 1:1. There are
complaints about reverse osmosis water system filtering more waste
water than filtered water, but with our product, we free you from
this worry. And waste water is by no mean a waste. Instead, you can
use your innovation to use this water to flop floor, clean yard, or
even wash car. Of course, this will also save you money on water
bills. It kills two birds with one stone! Another advantage of
buying our tankless RO system is its simple installation. It’s
normal to look at countless components, having no clues about how to
put them together to become one machine, let alone an enormous pure
water filter such as this. But please don’t worry about that. Our
filtered water dispenser is designed to be easy-to-install. Within
just a few minutes, the under-sink water filtration systems can be
installed and put to use. But make sure that once the installation
is finished, the first step is to turn on the faucet and flush the
system for about half an hour. The light on the faucet will flash
blue during this period time. Wait till it stops, and then you can
start to use the system and enjoy the excellent water filtration.
Water filter replacement is another advantage. Reverse osmosis
filter replacement is also quite simple, as it can be changed with
one single turn.
All in all, Waterdrop promises to give you the right home water
filtration system possible, so that you and your family members can
enjoy the great-tasting, pure, and healthy water. We regard having
healthy drinking water as one of the most important human rights,
and customers need is paramount, and we value your reverse osmosis
system reviews as these are what makes us see where our problems lie
and ways to help us progress! We are here to deliver the right water
filtration system!
Are these refurbished RO systems reliable?
Yes, we only sell machines that have undergone rigorous quality and
sanitation checks, and repackaging processes to ensure they function as
new. Additionally, all filter elements have been replaced with new ones,
giving you the peace of mind to use them with confidence.
How do I ensure that my refurbished RO system works optimally?
We recommend regular maintenance and cleaning of your used or refurbished
RO machine to ensure optimal performance. We also provide support and
guidance on maintaining your machine, including filter changes and routine
checks.
Will I receive a warranty with my refurbished G2 RO system?
Yes, we provide a 1-year warranty with each refurbished RO system that we
sell, giving customers peace of mind and protection against any unforeseen
issues.
How to change tankless reverse osmosis filters?
¼ left turn to take the filter out. Install a new filter and ¼ right turn.
What is the PH of reverse osmosis water?
Reverse osmosis water has a pH around the 6.5.
Is this reverse osmosis water filter system unit suitable for well water?
We do not recommend using well water as source for our RO systems.
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.
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.
Why is my tankless reverse osmosis system slow?
If you forget to change your water filters, with time your system will
produce less and less water. Clogged or fouled water filters is the most
common cause for a slow flow.
Is reverse osmosis water bad for you?
The process of reverse osmosis does not make water unhealthy in any way.
Rather, the purification benefits may protect you from many water-borne
contaminants.
What is the disadvantage of RO water?
One of the major disadvantages of RO systems for the home is that they
remove most of the minerals from the water leaving it with an acidic PH.
Also, during the purification process, there is waste water into your
drain pipe.
Is it safe to drink RO water?
Yes. Reverse osmosis water filter reduces many contaminants from your
drinking water.
Does tankless reverse osmosis kill viruses?
A reverse osmosis system will remove harmful viruses and bacteria whose
diameter is greater than 0.0001 μm from the source water.
Can tankless reverse osmosis remove viruses?
A reverse osmosis system will remove harmful viruses and bacteria whose
diameter is greater than 0.0001 μm from the source water.
What is left in the water after a reverse osmosis process?
Reverse osmosis does not remove everything. Most contaminants are
removed in most cases when passed through an RO membrane but there are
much smaller things can sometimes still be in the water after the
process
Which is the best water purifier for hard water?
Water softeners would be a better option when it comes to hard water
since they work better with hard water than any other type of water
purification system.
Would this system filter sodium out of my well water?
As a benefit of the RO membrane (filtration accuracy: 0.0001μm), this
product is able to reduce the sodium from the source water.
Can this tankless reverse osmosis system remove fluoride and hormones?
As a benefit of the RO membrane (filtration accuracy: 0.0001μm), this
product is able to reduce fluoride and hormones from the source water.
Can this RO filter be used with hard water?
Yes, this machine can be used with hard water, and the TDS reduction
rate will be 90% and above after complete flushing. But we do not
recommend using it as a source for the RO system directly.
What type of material is the faucet?
This model (WD-G2-W) comes with a brushed nickel faucet as default. The
lead-free faucet is made of food grade copper-zinc alloy, and a brushed
nickel plating is applied to its surface.
What is the waste water to filtered water ratio?
The waste to filtered water ratio is 1:1, which is much higher than the
traditional RO systems.
Could I buy Waterdrop tankless reverse osmosis system on amazon?
Your can buy from Amazon store Waterdrop Direct.
Does Waterdrop have tankless reverse osmosis system with remineralization?
Yes. We have.
Tankless vs tank reverse osmosis system
Tank reverse osmosis system holds reverse osmosis water so you have
plenty to use when you need it. A traditional tank reverse osmosis
system makes water slowly. It takes one minute to produce two to three
ounces of RO water. If you were to turn on your faucet for a glass of
water at the actual membrane production rate, then you would have to
wait at least 5 minutes for it to fill. Waterdrop tankless reverse
osmosis system has overcome the issue of bacteria colonizing in the
bladder tank. With no storage tank to fill, Waterdrop tankless reverse
osmosis system does not run until RO water is needed.
Can I use our own faucet?
Truly sorry, the brushed nickel faucet is the only option available
now.
You could use your own RO faucet with our product, but not normal faucet for tap water.
There are a few things you may need to know before purchasing one:
Firstly, our faucet is equipped with a filter life indicator, which allows you to monitor the filters' life easily. If you decide not to use our original faucet, this function will not be in effect.
Secondly, your RO faucet should be able to connect with the outlet tubing of the system, which has a diameter of 1/4".
In addition, it should have a "Quick-Connect Fitting", please click here.
OR, it should come with a set of accessory parts, which allows you to connect the faucet with the bare end of our outlet tubing. Please click here to see the example for your reference.
If the faucet does not meet one of these requirements, you will need to acquire a corresponding adapter, in order to complete the connection with the machine.
You could use your own RO faucet with our product, but not normal faucet for tap water.
There are a few things you may need to know before purchasing one:
Firstly, our faucet is equipped with a filter life indicator, which allows you to monitor the filters' life easily. If you decide not to use our original faucet, this function will not be in effect.
Secondly, your RO faucet should be able to connect with the outlet tubing of the system, which has a diameter of 1/4".
In addition, it should have a "Quick-Connect Fitting", please click here.
OR, it should come with a set of accessory parts, which allows you to connect the faucet with the bare end of our outlet tubing. Please click here to see the example for your reference.
If the faucet does not meet one of these requirements, you will need to acquire a corresponding adapter, in order to complete the connection with the machine.
What does Pure to Drain Rate mean?
The reverse osmosis water filter relies on a semi-permeable membrane to
filter out impurities from drinking water. When the tap water is
compressed through the RO membrane, it produced pure water and waste
water. The ratio of pure water to waste water is called wastewater
ratio. 1:1 wastewater ratio means 1 gallon water is wasted per 1 gallon
purified, and 2:1 wastewater ratio means 1 gallon water is wasted per 2
gallon purified. The higher the wastewater ratio is, the less waster
water produced during the filtration process. During the use of RO water
filter, the actual ratio might be lower than the labeled, depending on
many factors such as water quality, pH, pressure and temperature.
At Waterdrop, we know that access to clean and safe drinking water is
essential for everyone's health and well-being. That's why we are
committed to providing you with affordable and dependable options for
your water filtration needs.
Why Opt for the Refurbished G2 RO System?
Cost-effective
Waterdrop refurbished G2 RO system is priced significantly lower than
new ones. You can save up to 30% or more by purchasing a refurbished RO system
from us.
High-quality Standards
We have taken great care in inspecting and sanitizing each machine to
ensure they meet our high-quality standards. You can rest assured that
every machine has been repackaged to look and perform like new.
Environmentally Friendly
By purchasing a refurbished RO system, you are contributing to a more
sustainable future by reducing waste and minimizing the impact on the
environment.
Fully Functional
Our pre-owned RO systems are not only fully functional, but they also
have the same high-performance capabilities as a new system. You can
trust that you are purchasing a reliable product that has been
inspected, cleaned, and serviced to meet our rigorous standards.
Additionally, all filter elements have been replaced with new ones,
giving you the peace of mind to use them with confidence.
1-year Warranty
We provide a 1-year warranty with each refurbished G2 RO system that we
sell, giving customers peace of mind and protection against any
unforeseen issues.
Waterdrop is committed to providing our customers with exceptional value
for their money. Our refurbished RO systems are no exception, and we
stand behind their quality with our rigorous inspection and sanitation
processes. You can trust that you are making a smart choice for your
wallet and the environment when you purchase a refurbished G2 RO system
from us.


Composite filter technology
- The new composite filter technology employs an excellent filter combination to achieve more efficient filtration.
- The composite water filters can effectively reduce most contaminants.


Composite integrated filters
- CF filter reduces rust, sediment, large particles, chlorine, taste and odor.
- MRO filter effectively reduces most contaminants, such as chloramine, antibiotics, organic matter, heavy metals, nitrite, bacteria, and limescale. This reverse osmosis water filter improves the taste of water and provides purified water that is as fresh as spring water.
Reverse osmosis membrane
- The reverse osmosis membrane has a pore size of 0.0001 μm, which is one-millionth of a strand of hair. Bacteria and viruses are 5,000 times larger than its pore size.
- Therefore, only water molecules and some beneficial mineral ions can pass through the RO membrane. Heavy metals and other impurities are discharged from the waste water tubing.
- The G2 RO membrane can reduce most harmful substances in water.


Innovative tankless design
- The tankless reverse osmosis system ensures the safety of your family’s drinking water.
- This compact RO system also saves over 70% more under-sink storage space as compared to traditional reverse osmosis water filter systems.
- The tankless design avoids recontamination, such as bacterial growth.
Kind notice:
- Please refer to this diagram and be informed that you need to drill a hole on your countertop to place the smart faucet (No need for this step if your countertop already has a hole).
- Besides, an adapter will be installed on your household water tubing to connect to RO system’s wastewater tubing and input water tubing.
- Electricity is required to run the RO system.
- We do not recommend using well water as source for our RO systems. We do not recommend connecting tankless RO to a refrigerator or ice maker.
- It's highly recommended to install our RO system with components provided by Waterdrop. Installing the system with any parts or accessories that are not provided by Waterdrop may cause the system to malfunction or shorten the lifetime of the system/filters.


Fills a cup of water in 12 seconds
- This G2 Reverse Osmosis Water Filtration System offers a fast water flow rate of up to 400 GPD. Get a cup of filtered water in 12 seconds, satisfying your needs while saving time.
- Compared t o the traditional RO water filter system, which only has continuous water flow during the first two minutes, Waterdrop reverse osmosis system always has a stable water flow.
Compare
RO System Models
RO System Models


Smart filter life reminder
- 3 colors of lights show the status of water filters.
- Blue means your water filters are functioning well.
- Purple means you need to replace the water filter soon. You still have 15 days to replace it.
- Red means you have to replace the water filter immediately.
Easy to install
- Installing the Waterdrop G2 under sink water filtration system takes less than 30 minutes.
- Due to the twist-and-pull design, you can replace the water filter in 3 seconds.


1:1 low drain ratio
- All reverse osmosis water purification systems will produce concentrated water to discharge impurities.
- Compared to traditional RO water purifiers, the G2 RO system produces less concentrated water and saves 300% more water.
- You can collect concentrated water to mop the floor, wash your car, do laundry, etc.
Protects each baby's health
- Newborns are very delicate. Compared to tap water, RO water is purer, cleaner and more suitable for babies. Milk powder made by RO water is easier to be absorbed.

![]() G2 RO Filtration System |
![]() D4 RO Filtration System |
![]() G3 RO Filtration System |
![]() G3P800 RO Filtration System |
![]() D6 RO Filtration System |
![]() G2P600 RO Filtration System |
|
Need Installation | √ | √ | √ | √ | √ | √ |
---|---|---|---|---|---|---|
Beneficial Minerals | × | × | × | × | × | × |
Flow Rate | 400 GPD | 400 GPD | 400 GPD | 800 GPD | 600 GPD | 600 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.
|
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Faucet | Ordinary faucet | Ordinary faucet | Smart faucet | Smart faucet | Smart faucet | Ordinary faucet |
Display | Filter lifespan | Filter lifespan | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan |
Self-clean | × | √ | √ | √ | √ | × |
Holiday mode | × | × | √ | √ | √ | × |
Electricity Required | √ | √ | √ | √ | √ | √ |
Filter Cartridges |
WD-G2CF WD-G2MRO |
WD-D4RF |
WD-G3-N1CF WD-G3-N2RO WD-G3-N3CB |
WD-G3-N1CF WD-G3P800-N2RO WD-G3-N3CB |
WD-D6RF |
WD-G2CF WD-G2P6MRO |
Noise(≤) | 55dB | 55dB | 65dB | 65dB | 55dB | 55dB |
Filter Lifespan | CF-12 Mths MRO-24 Mths |
12 Mths | CF-6 Mths CB-12 Mths RO-24 Mths |
CF-6 Mths CB-12 Mths RO-24 Mths |
12 Mths | CF-12 Mths P6MRO-24 Mths |
Dimensions(inch) | 17.32*5.91*13.9 | 16.02*6.22*12.44 | 18.11*5.67*17.72 | 18.11*5.67*17.72 | 15.98*5.98*11.97 | 17.32*5.91*13.9 |
![]() WD-G2CF |
![]() WD-G2MRO |
|
Filtration Media | Sediment PP membrane and activated carbon block | Reverse osmosis membrane and activated carbon block |
---|---|---|
Filter Lifespan | 12 months or 1,100 gallons | 24 months or 2,200 gallons |
Size (Diameter * Height) | 4.9" * 8.1" | 4.9" * 15" |
Compatible Model | WD-G2-B/WD-G2-W/WD-G2P600-W/WD-G2MNR-W | WD-G2-B/WD-G2-W/WD-G2MNR-W |
![]() G2 RO Filtration System |
![]() D4 RO Filtration System |
![]() G3 RO Filtration System |
![]() G3P800 RO Filtration System |
![]() D6 RO Filtration System |
![]() G2P600 RO Filtration System |
|
Need Installation | √ | √ | √ | √ | √ | √ |
---|---|---|---|---|---|---|
Beneficial Minerals | × | × | × | × | × | × |
Flow Rate | 400 GPD | 400 GPD | 400 GPD | 800 GPD | 600 GPD | 600 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 | Ordinary faucet | Smart faucet | Smart faucet | Smart faucet | Ordinary faucet |
Display | Filter lifespan | Filter lifespan | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan & TDS | Filter lifespan |
Self-clean | × | √ | √ | √ | √ | × |
Holiday mode | × | × | √ | √ | √ | × |
Electricity Required | √ | √ | √ | √ | √ | √ |
Filter Cartridges |
WD-G2CF WD-G2MRO |
WD-D4RF |
WD-G3-N1CF WD-G3-N2RO WD-G3-N3CB |
WD-G3-N1CF WD-G3P800-N2RO WD-G3-N3CB |
WD-D6RF |
WD-G2CF WD-G2P6MRO |
Noise(≤) | 55dB | 55dB | 65dB | 65dB | 55dB | 55dB |
Filter Lifespan | CF-12 Mths MRO-24 Mths |
12 Mths | CF-6 Mths CB-12 Mths RO-24 Mths |
CF-6 Mths CB-12 Mths RO-24 Mths |
12 Mths | CF-12 Mths P6MRO-24 Mths |
Dimensions(inch) | 17.32*5.91*13.9 | 16.02*6.22*12.44 | 18.11*5.67*17.72 | 18.11*5.67*17.72 | 15.98*5.98*11.97 | 17.32*5.91*13.9 |
![]() WD-G2CF |
![]() WD-G2MRO |
|
Filtration Media | Sediment PP membrane and activated carbon block | Reverse osmosis membrane and activated carbon block |
---|---|---|
Filter Lifespan | 12 months or 1,100 gallons | 24 months or 2,200 gallons |
Size (Diameter * Height) | 4.9" * 8.1" | 4.9" * 15" |
Compatible Model | WD-G2-B/WD-G2-W/WD-G2P600-W/WD-G2MNR-W | WD-G2-B/WD-G2-W/WD-G2MNR-W |

WD-G2CF Filter for Waterdrop G2P600 Reverse Osmosis System
- The 2-in-1 composite filter uses a natural activated carbon block and a sediment PP membrane.
- Provides you with 12 months or 1,100 gallons of clean filtered water.
- You can replace the filter in 3 seconds with a single twist. No tools are required.
29.99
Total price: 29.99
Total price: 29.99

WD-G2MRO Filter for waterdrop G2 Series Reverse Osmosis System
- Provides you with 24 months of clean filtered water. You can replace the water filter in 3 seconds with a single twist. No tools are required.
89.99
Total price: 89.99
Total price: 89.99

Remineralization Filter for All Series Waterdrop Reverse Osmosis
Systems-Waterdrop MNR35
- 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.
29.99
Total price: 29.99
Total price: 29.99