.Author: Maurice Savaryego, M.Sc.Eng. (Learn More)
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​Compare Best Tankless Reverse Osmosis Water Filtration Systems: Waterdrop WD-G2-W vs. Waterdrop WD-G3-W

Delicious & Clean Waterdrop
RO System Filtered Water
(Photo credits: Waterdrop)

The treated tap water supplied by our municipalities to our homes can still contain some contaminants and some unpleasant taste due to chemicals such as chlorine or fluoride used during the water treatment. 

Some people use water filter pitchers to further purify the tap water. But when you need larger quantities of drinkable filtered water for larger families and also for cooking, water filter pitchers are not enough. A good solution that provides plenty of continuously available filtered water requires the installation of an undersink water filtering system.

There are mainly two types of undersink water filtering systems: those that require a tank for the accumulation of the filtered water and those that are tankless. Tankless water purification systems have two main advantages:

• They save a large amount of space that can be used for storing other stuff.
• They prevent secondary pollution, such as mold and bacteria build-up that can happen inside not properly maintained tanks.

Waterdrop tankless Reverse Osmosis (RO) water filtration systems are innovative, all-in-one, intelligent water filtering systems that use a best in class RO membrane to effectively remove over 1,000 harmful substances. In addition to being tankless, the Waterdrop RO filtration systems come with a sleek design, easy installation, high flow-rate and very simple filter replacement procedure. Note that the installation of these electrically powered systems require an electrical outlet as well as connection to your sink’s cold water supply.

Reverse Osmosis (RO) filtering systems result in very high filtering specifications and is achieved by the household water pressure pushing the water through a special semi-permeable membrane with ultra small pores from 0.001 to 0.00001 micron. The RO membrane achieves very high filtering specifications, effectively removing more than 99% of harmful substances, such as dissolved salts (ions), particles, colloids, organics, toluene, fluoride, TDS (Total Dissolved Solids), scale, heavy metals, bacteria and pyrogens from the feed water. Note that RO system should not be relied upon to remove 100% of bacteria and viruses, and therefore should only be used for further purifying tap water. 

Finally, note that Waterdrop filtration systems are the first smart RO systems with composite RO membrane and tankless design in the U. S. market.
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This article will compare the Waterdrop WD-G2-W and Waterdrop WD-G3-W tankless Reverse Osmosis water filtration systems: These were not just the most popular among Amazon customers at the time this article was written, but they had also received excellent reviews from most Amazon buyers (average ratings of 4.5 stars out of 5 stars for both!).

Note that the Waterdrop WD-G2-W filtration system is the white colored version of this product which also comes in a black colored version indicated by Waterdrop WD-G2-B.
The Waterdrop WD-G2-W/B notation will be used below to indicate both versions which have identical features.
Note also that Waterdrop WD-G3-W comes only in white.

If you are in a hurry and wish to see right away Amazon price information for these two robotic pool cleaners, please click below:
Waterdrop RO Water Filtering Systems on Amazon

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Comparing the Waterdrop WD-G2-W and  WD-G3-W/B RO Water Filtering Systems

The following pictures show the two Waterdrop RO filtering systems to be compared below:

Waterdrop WD-G2-W

Waterdrop WD-G3-W

The following table compares the features of the two Waterdrop RO filtering systems (please read the explanations to the table notes that follow for a better understanding of the features):

Compare Table Notes 1 - 8 Explanations
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Note 1:

• The compact Waterdrop RO systems save considerable amount of storage space when compared to traditional Reverse Osmosis water filter systems.
• The tankless design avoids recontamination, such as mold and bacterial growth.

The following pictures compares the tankless RO filtering system design with traditional RO systems:

Comparing Tankless and With-Tank Designs

(Photo credits: Waterdrop)

Note 2:
Thanks to their internal pump, the Waterdrop RO systems offer faster water flow (400 gallons per day). These systems can filter a cup of water in about 12 seconds. They can produce pure water quickly, thereby meeting the needs of your whole family and even small companies.

Note 3:
​For both Waterdrop RO filtering systems considered here, as you can see in the following pictures, the filters are integrated into the main units, and it takes mere seconds to replace them.

The two filters on ​Waterdrop-WD-G2-W/B effectively provide five stages of filtration:
​
Filter 1: The 2-stage CF composite filter uses a natural activated carbon block and a sediment PP membrane.

• Removes chlorine, taste and odor, organics, sand, rust, particulates, suspended solids, and other impurities.
• 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 required.

Filter 2: The 3-stage composite MRO filter uses a sediment PP membrane, an activated carbon block and a Reverse Osmosis membrane with an accuracy of 0.0001 μm.

• Removes more than 1,000 impurities and improves the taste of water.
• Provides you with 24 months or 2,200 gallons of clean filtered water.
• You can replace the filter in 3 seconds with a single twist. No tools required.

The three filters on ​Waterdrop-WD-G3-W provide effectively seven stages of filtration:

Filter 1: The 3-stage CF composite filter uses a natural activated carbon block and two sediment PP membranes.

• Tested and certified by NSF International against NSF/ANSI standard 58. The TDS removal rate is certified to be up to 94%.
• Tested and certified by NSF International against NSF/ANSI standard 372 for lead-free material.
• Removes chlorine, taste and odor, sand, rust, solids, and other impurities.
• You can replace the filter in 3 seconds with a single twist. No tools required.
• Provides up to 6 months or 550 gallons of clean water.  

​Filter 2: The 3-stage composite RO filter uses a 3-layer DOW® RO membrane (0.0001μm pore size):

• Tested and certified by NSF International against NSF/ANSI standard 58. The TDS removal rate is certified to be up to 94%.
• Tested and certified by NSF International against NSF/ANSI standard 372 for lead-free material.
• Reverse Osmosis membrane filter, providing safe and healthy water.
• Effectively removes 1,000+ contaminants.
• Superior DOW® RO membrane prevents the bacteria and viruses from building up.
• You can replace the filter in 3 seconds with a single twist. No tools required.
• Provides up to 24 months or 2,200 gallons of clean water.

Filter 3: The single stage activated carbon block filter CB uses high precision activated carbon granules made from natural coconut shell, which will also return beneficial minerals into the water and improve the water taste:

• Tested and certified by NSF International against NSF/ANSI standard 58. The TDS removal rate is certified to be up to 94%.
• Tested and certified by NSF International against NSF/ANSI standard 372 for lead-free material.
• Superior coconut shell activated carbon block with a smaller pore size.
• Effectively improves the taste and smell of purified water.
• You can replace the filter in 3 seconds with a single twist. No tools required.
• ​Provides up to 12 months or 1,100 gallons of clean water.

The new composite filter element technology used on Waterdrop RO filtering systems results in more efficient filtering out of harmful substances.
The followig pictures show the filter confgurations used by both Waterdrop RO filtering systems:

Waterdrop WD-G2-W/B Filter Configuration

Waterdrop WD-G3-W Filter Configuration

Note 4:
The faucets that come with both Waterdrop systems considered here have lead-free construction.
The smart faucet that comes with Waterdrop WD-G3-W is equipped with an indicator of filter service life: a circular colored light glows around the base of the faucet and changes color with time as the filter is used:

• Blue light indicates that the filter is still working properly.
• Yellow light indicates that replacement may soon be required.
• Red light indicates that immediate replacement of the filter is required.

Note 5:
The Total Dissolved Solids (TDS) indicator on Waterdrop WD-G3-W indicates the real-time water quality at a glance.

Note 6:

• Waterdrop WD-G2-W/B is equipped on its front panel with 2 filter reminder LEDs that light when it’s time to replace the filters (see following picture).
• Waterdrop WD-G3-W is equipped on its front panel with 3 filter reminder LEDs that light when it’s time to replace the filters. This is in addition to the colored ring at the base of the faucet that indicates filter status (see following picture).

Note that for both products, thanks to the design of these systems, the filters take seconds to replace.
The following pictures show the filter and TDS indication lights on the front panels of the Waterdrop RO systems considered:
​

Waterdrop WD-G2-W/B Filter Life Lights

Waterdrop WD-G3-W Filter Life Lights + TDS Water Quality Indication

​Note 7:
​The integrated water circuit design of these two Waterdrop RO systems helps avoid any leakage.

Note 8:
​Waterdrop WD-G3-W will automatically flush the unit after some amount of use. Also, if you are away for a longer period of time, the unit will flush once every day. Automatic flushing prevents any sort of unwanted build-up that could cause shorter filter life and even blockages.

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So which of the two Waterdrop RO Water Filtering Systems to Buy?

The two Waterdrop RO filtering systems considered here are excellent products that come with some great features:

• They both come with a tankless design which saves space and prevents mold and bacteria accumulation.
• They both provide a water flow rate of 400 gallons per minute (they can fill a cup of water in 12 seconds).
• They provide multi-stage filtering including Reverse Osmosis stages.
• They come with a faucet included. 
• They are both equipped with filter life indicators and with filters that can be replaced in seconds.
• They have an integrated waterway design which prevents leakages.

However, Waterdrop-WD-G3-W presents a number of advantages over Waterdrop-WD-G2-W/B:

• It has a 7-stage filtration system which results in even cleaner and better tasting water.
• It is equipped with a Total Dissolved Solids (TDS) indicator that shows at a glance the real-time water quality.
• The faucet it comes with has glowing and color changing lights at its bottom that indicate filter state.
• It automatically flushes the unit after some amount of use which prevents any sort of unwanted build-up that could cause shorter filter life and even blockages.

​For price information on these robotic pool cleaners or to purchase see below:

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Compared Waterdrop WD-G2-W/B and  WD-G3-W RO Water Filtering Systems on Amazon

Please click the Amazon US link image below for the product of your choice to see exact price information or to purchase.
​Please Note: For non-US customers, when you click the links below, you will be provided with the Amazon links for your country (such as Canada or UK), if the product is available in your country.
​

Waterdrop WD-G2-W
Tankless Reverse Osmosis
Water Filtration Systems

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Waterdrop WD-G3-W
Tankless Reverse Osmosis
Water Filtration System

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