Comparing Waterdrop Vs. iSpring Tankless RO System

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There are many perks connected to installing the best reverse osmosis system in your home. Not only will you save a lot of expenses by treating your water economically, but you also get to enjoy great-tasting water at all times.

In this post, we compare two reverse osmosis water filtration systems, the Waterdrop WD-G3-CR and the iSpring RO500AK-BN, models from 2 top brands in the water filtration industry, Waterdrop, and iSpring.

Although both systems offer superior filtration performance and produce great-tasting water, they still have a few differences that set them apart.

After going through this article, you’ll be in a position to tell the model that suits your home best. Continue reading.

Waterdrop Vs iSpring Tankless RO Comparison Table

FeatureWaterdrop WD-G3-CRiSpring RO500AK-BN
Dimensions18.12 x 5.67 x 17.7217.5 x 5.2 x 16.25 inches
Weight37.1 pounds27.51 pounds
Water filtration stages7 filtration stages3 filtration stages
Water flow rate400 gallons per day500 gallons per day
Pure to waste water ratio1:12:1
Filter life indicatorNot mentionedAvailable
TDS meterNot mentionedAvailable
CertificationsNSF/ANSI 58  and 372 certifiedNot mentioned
RemineralizationNo remineralizationRemineralization takes place
Warranty1-year manufacturer warranty + seller combination30-day money-back guarantee,1-year manufacturer warranty, extended warranty upon product registration
PriceCheck on AmazonCheck on Amazon

Waterdrop WD-G3-CR Overview

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The Waterdrop WD-G3-CR is a white tankless under sink reverse osmosis system that filters water in 7 stages. It removes 99% of harmful substances from water and improves its taste and smell.

It has a daily output of 400 gallons and a pure to drain ratio of 1:1. It works more efficiently than most RO systems which usually operate at ratios around 1:3 to 1:4.

At 8.12 x 5.67 x 17.72, the G3 is a little bulky. It weighs 37.1 pounds, is NSF/ANSI 58 and 372 certified, and is easy to install.

  • Design

The WD-G3-CR features an intelligent tankless design that fits under standard sink spaces. It is perhaps too stylish to be tucked under the sink.

This unit doesn’t come with a storage tank, thus easy to maintain. You also won’t have to worry about secondary contamination.

The water produced is sent directly to the faucet when turned on.

  • Bright Chrome Faucet

The G3 comes with a quality faucet made of a chrome base and a stainless spout with a nice finish. The faucet will give your sink area an elegant appearance.

  • Innovative Composite Filter

It comes with 3 innovative composite filters that filter the water in 7 stages. These filters enhance quick water dispensing and make superior filtration performance possible.

The filters intercept impurities larger than 0.0001 microns like TDS, chlorine, and heavy metals. They also help to improve the taste of the water.

  • Water Flow Rate

The G3 produces up to 400 gallons of water per day, saving 3 times more than conventional RO systems. With the fast flow rate, it can fill a glass of water in 12 seconds.

The unit takes less time to satisfy the high demand for quality water at home and in the office. It is also highly efficient, with a rain ratio of 1:1.

  • Built-in Pump

Like any other Waterdrop RO system, the G3 comes with an innovative built-in pump that detects the pressure of the incoming water and adjusts as appropriate for the best results.

The pump helps minimize waste and fasten the production of pure water.

  • Smart Leakage Protector

The G3 has a built-in leakage protector that prevents leaks when detected. It helps protect your floors from water damage or accidental falls caused by slipping on wet floors.

  • Certifications

This Waterdrop RO model has a TDS reduction rate of up to 90% and uses lead-free material, which is tested and certified against NSF/ANSI 58 and 372.

The system is proved not to contain chemicals such as bisphenol, benzene, lead, and cadmium, among others. It has passed more than 400 chemical lab tests.

  • Installation and Maintenance

The system arrives partly assembled and is designed for simple DIY installation in less than 1 hour.

You just need to connect the unit to the faucet and your electricity supply following the instructions in the manual that comes with the package.

You can also connect the G3 to a refrigerator and icemaker, but this requires the purchase of additional tubing.

Filters require changing, and the process is a breeze.

Pros and Cons

  • Built-in pump speed up water flow
  • Removes up to 99% of harmful contaminants
  • Quick installation and filter replacement
  • Compatible with an ice maker and a refrigerator
  • It has a super-low drain ratio
  • Supported by a 1-year warranty


  • No remineralization

iSpring RO500AK-BN Overview

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The iSpring RO500AK-BN has raised the bar for water purification. It effectively removes up to 99% of over 1000 contaminants from water, including chlorine, arsenic, asbestos, fluoride, sodium, and more.

The unit has a fast flow rate of 0.4 gallons per minute, exceptional pure water to waste ratio of 2:1, and fills an 8oz cup within 10 seconds.

At 17.5 x 5.2 x 16.25 inches, the unit can fit under any standard sink space. It weighs 27.51 pounds, is easy to install, and is backed by a 1-year manufacturer warranty.

  • Innovative Design

The RO500AK is a sleek tankless under sink system that overcomes all traditional RO systems filtration drawbacks. It frees more space in your under-sink space and adds aesthetic pleasure to any kitchen.

It features a filter change indicator, real-time water quality monitoring, and quick filter replacement. All these make the unit one of the most advanced systems you can find around.

  • Filtration Process

The RO500Ak filters water in 3 stages. Each stage is designed to eliminate contaminants and progressively improve your water’s quality.

In the 1st stage, a composite filter (FCF500) utilizes a multi-layer design and removes rust, sand, dirt, silt, chlorine, and unpleasant odor.

In stage 2, a 500GPD high flow RO membrane (MRO500) removes over 1,000 contaminants, including lead, fluoride, arsenic, and more.

And in the final stage, a carbon alkaline filter (FCA500) further polishes the purified water. It also balances PH by adding essential minerals back into the RO water.

  • Water Flow Rate

The system produces 500 gallons of pure water per day and has a fast flow rate of 0.4 gallons per minute,4x more efficient than a traditional RO system.

With an exceptional pure to waste water ratio of 2:1, the unit saves water waste by 400%. This contributes to less water going down the drain and reduced water bills.

  • Hassle-Free DIY Installation

Using the detailed instructions manual that comes with the system, you can set up the system with ease. Filter changes are also easier thanks to the model’s integrated design.

You don’t need to switch off the water supply when changing the filters.

  • Warranty

The iSpring RO500AK-BN is backed by a 30-day money-back guarantee and a 1-year manufacturer warranty. There’s also an extended warranty after product registration.

Pros and Cons

  • High water production rate of 500 gallons per day
  • Ideal for large families and companies
  • Highly efficient with a pure to drain ratio of 2:1
  • Easy to install and maintain
  • It has a filter life indicator and TDS meter
  • Backed by a 30-day guarantee and a 1-year warranty
  • It has a remineralizing filter
  • Produces tasty water


  • Replacement filters are difficult to find
  • Expensive