Ispring Ro500 Vs Waterdrop G3: Which Is Right For You?

Are you looking for a high-performance but affordable water filtration system?

If so, you may have come across the iSpring RO500 and the Waterdrop G3.

Technician installing a filtration system in the kitchen

Both of these tankless reverse osmosis (RO) systems are popular choices for homeowners who want to improve the quality of their drinking water.

But which one is right for you?

In this article, we'll look at the differences between these two systems, including their design, filtration performance, and ease of installation.

Let's start!

Ispring Ro500 Overview

See the iSpring RO500 on Amazon.

The iSpring RO500 is a compact, high-performance water filtration system.

Its tankless design contrasts traditional systems that need a separate storage tank, simplifying installation.

It features a smart faucet showing real-time TDS levels and filter life, ensuring timely filter replacements.

The system employs a 3-stage filtration process, removing up to 99% of over 1,000 contaminants, including lead and chlorine.

Its 500 GPD flow rate provides quick access to clean water.

Finally, you'll love its 2:1 pure-to-wastewater ratio, which wastes only one gallon of water per or every two gallons of purified water produced.

Waterdrop G3 Overview

See the Waterdrop G3 on Amazon.

If you're looking for a high-performance but affordable water filtration system, the Waterdrop G3 is a great option to consider. 

Utilizing an 8-stage process, it removes contaminants like sediment, chlorine, and heavy metals.

Although it shares a tankless design with the iSpring RO500, it offers a less efficient 1:1 pure-to-wastewater ratio.

Its brilliant faucet offers insights into TDS levels, filter lifespan, and water quality. With the provided DIY kit, installation is straightforward and quick.

Ispring Ro500 Vs Waterdrop G3: Key Differences

Here is a short comparison table on the main factors discussed below.

Feature iSpring RO500 Waterdrop G3
Filtration Process 3-stage filtration system 8-stage filtration system
Filter Lifespan Composite Filter: 1 yr
RO Membrane: 2-3 yrs
Carbon Block: 1 yr
Activated Carbon: 6 mos
Pre-sediment & Carbon Block: 24 mos
RO Membrane: 12 mos
Contaminants Removed Up to 99% TDS reduction
Handles around 1,000 impurities
Up to 91.9% TDS reduction
Specific number not provided
Flow Rate 500 GPD 400 GPD
Installation & Maintenance Easy to install & maintain Easy to install & maintain
Certifications Not specified NSF 372 & 58
Upfront Cost ~$600 ~$500
Annual Cost $80-$90 $90-$120
Warranty 1-year 1-year

Filtration Process

The iSpring RO500 employs a three-stage filtration system. Initially, it combines sediment and carbon block filters.

Following this is an RO membrane in the second stage, and the third stage utilizes another carbon block filter.

A three-stage filtration system underneath the kitchen sink

On the other hand, the Waterdrop G3 uses an 8-stage filtration approach. It begins with a CF filter comprising PP cotton and a carbon block.

At its core is a 3-layer RO membrane. The process concludes with a post-activated carbon block made from coconut shells.

Moreover, the Waterdrop G3 offers an option to include a remineralization filter. This adds beneficial minerals back into the water, which some people prefer.

Filter Lifespan

The lifespan of the filters in your RO system will affect how often you need to replace them.

When considering the iSpring RO500, here's how often you'd need to change its filters:

  • Composite Filter: 1 year
  • RO Membrane: 2-3 years
  • Carbon Block: 1 year

If you're eyeing the Waterdrop G3, here's the breakdown of its filter lifespans:

  • Activated Carbon Filter: 6 months or 550 gallons
  • Pre-sediment and Carbon Block Filter: 24 months or 2,200 gallons
  • Reverse Osmosis Membrane Filter: 12 months or 1,100 gallons

In other words, you can expect the Spring RO500 to require an annual filter swap, with its RO membrane stretching 2-3 years.

On the other hand, the Waterdrop G3 can range from 6-month to 24-month lifespans.

Keep in mind that the lifespan of your filters will depend on your water usage and the quality of your source water.

Contaminants Removed

Both the Ispring Ro500 and Waterdrop G3 can remove a wide range of contaminants from your water, including lead, chlorine, arsenic, and fluoride.

However, the Ispring Ro500 is better at removing TDS (total dissolved solids) from your water.

The Ispring Ro500 can reduce TDS levels by up to 99%, while the Waterdrop G3 can reduce TDS levels by up to 91.9%.

In terms of the number of contaminants removed, the Ispring Ro500 is quite extensive, tackling around 1,000 impurities.

Meanwhile, we couldn't find the exact number of contaminants removed by the Waterdrop G3, as there doesn't seem to be a specific datasheet on their page. 

Flow Rate

The flow rate of your RO system will affect how quickly you can get clean water. The Waterdrop G3 has a faster flow rate than the Ispring Ro500.

The Waterdrop G3 can produce up to 400 gallons of water per day (GPD), while the Ispring Ro500 can produce up to 500 GPD.

However, note that the flow rate will depend on your water pressure and temperature.

Installation and Maintenance

Both the Ispring Ro500 and Waterdrop G3 are easy to install and maintain. They both come with detailed instructions and all the necessary parts and accessories.

In terms of maintenance, both systems require regular filter replacements and occasional cleaning.


The Ispring Ro500 does not provide specific information about certifications on its product page.

In contrast, the Waterdrop G3 boasts several noteworthy certifications.

It holds NSF 372 certification, signifying it uses lead-free materials to eliminate lead exposure effectively.

Furthermore, the system is certified under NSF 58, demonstrating its capability to reduce 91.9% of total dissolved solids (TDS).

Upfront Cost

The Ispring Ro500 is slightly more expensive than the Waterdrop G3, but not by much.

The Ispring Ro500 typically costs around $600, while the Waterdrop G3 costs around $500.

Depending on your installation requirements, the prices can increase if you purchase additional accessories and parts.

Annual Cost

In addition to the upfront cost, you should consider the annual cost of operating and maintaining your RO system.

This includes the cost of replacement filters, electricity, and water waste.

The Ispring Ro500 has a slightly higher annual cost than the Waterdrop G3, as it uses more electricity and produces more wastewater.


Finally, you should consider the warranty offered by each system.

Both the Ispring Ro500 and the Waterdrop G3 come with a 1-year warranty, with the Ispring Ro500 offering extended 3-year and 10-year warranty options.

These warranties cover defects in materials and workmanship but not damage caused by misuse or improper installation.

Also read: Frizzlife Vs Waterdrop Vs Aquasana: Which Is Right For You?

Pros And Cons

Here are the pros and cons of each system to consider:

Pros Of Ispring Ro500

  • Longer filter lifespan
  • Better at removing TDS
  • Extensive contaminant removal
  • Less wastewater

Cons Of Ispring Ro500

  • Slightly more expensive upfront cost
  • Not backed with any testing or certifications

Pros Of Waterdrop G3

  • Remineralization filter
  • Lower upfront cost
  • Backed with NSF certifications
  • Sleek and modern design

Cons Of Waterdrop G3

  • Shorter filter lifespan
  • Slightly more complex installation
  • Lower TDS removal rate

User Reviews And Complaints

Before taking a pick, knowing what other users say about the products you're considering is essential.

Here are some reviews and complaints from people who have used the iSpring RO500 and Waterdrop G3.

What People Are Saying About Ispring Ro500

Many users are happy with the performance of the iSpring RO500.

They appreciate its high flow rate and the fact that it removes many contaminants, including lead and chlorine.

Some users also find the installation process to be relatively easy.

However, some users have had issues with leaks and other malfunctions.

What People Are Saying About Waterdrop G3

Users of the Waterdrop G3 generally appreciate its sleek design and that it doesn't take up much space.

They also like that it produces water quickly and is easy to install and maintain.

However, some users have reported issues with the system's durability.

Some people have also found that the system produces a lot of noise, especially when running at total capacity.

Continue reading: Waterdrop G2 Vs G3 Vs D6 Reverse Osmosis Systems: Which Is Right For You?

The Verdict — Ispring Ro500 Vs Waterdrop G3: Which Is Right For You?

At the end of the day, the decision between the iSpring RO500 and the Waterdrop WD-G3-W comes down to your specific needs and preferences.

If you're looking for extensive contaminant removal and has a highly efficient filtration process, the iSpring RO500 might be the best choice for you.

On the other hand, if you prioritize a affordability that doesn't compromise performance and a sleek, modern design, the Waterdrop WD-G3-W might be the better option.

Consider your budget, the size of your household, and your water usage habits when deciding.

Whichever system you choose, you can rest assured that you'll be getting high-quality, filtered water for you and your family.

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Many thanks to OpenAI's ChatGPT for helping fine-tune the creation of this article.