Brondell H2O+ Reverse Osmosis Water Filter System Review

If you want the closest to 100% clean drinking water, chances are you’re not going to get there without a reverse osmosis (RO) filter. Filtering water through RO is the most efficient method approved by government institutions. The only downside with some systems is that they tend to have a high water waste rate.

This article will present you with one of the few RO units that don’t have this drawback. It is a point-of-use filtration unit that comes with a water tank and supports a decent water pressure range. Here are the details on how it works and how you can get your hands on it.

Brondell H2O+ Review

The Circle system from Brondell is a rather new product. It first hit the market in the summer of 2015. It was designed to be efficient at cleaning water with less waste water than other RO units. Since its release it has managed to maintain its popularity among customers, and for good reason.

RO filtration units are the most effective by far at eliminating heavy metals, chlorine and fluoride from water. What makes the Brondell Circle even better is that the RO membrane is also accompanied by a sediment filter and two carbon filters. This way it tackles more contaminants than most products in this category.

While it may not be the easiest to install for everyone, it can still be a DIY project if you follow the instructions carefully. The customer support team at Brondell did a great job at providing instructional videos and accompanying texts and diagrams in the manual.

What’s even cooler about this system is the water storage tank. This fills up in about one hour and allows you to have clean, ready-to-drink water at all times. Most RO filtration units tend to mess with pressure levels and limit flow rate due to the inefficient process of pushing water through the RO membrane, and the Circle is no different.

Brondell H2O+

Who is This Water Filter for?

Despite its rather bulky appearance, the Brondell H2O+ Circle is a water system filter that can fit under almost any kitchen sink. So whether you live in a small apartment or a large house, you can benefit just as much from having the Circle system installed.

The installation process can be a bit more complicated if some requirements are not met. You might need drilling and extra accessories to fully integrate the Circle in your home. Because of this, it might not be a good fit for people looking for a DIY project, even though the instructional videos are quite detailed.

The Circle has four filtering stages which can deliver exceptional quality drinking water. That being said, it is only a point-of-use system so it won’t affect the rest of the water in your house. If you have trouble with sediment concentration damaging your appliances or chlorine gas release in the shower, the Brondell Circle will not be enough.

What’s Included?

All parts needed for installation are included but you’ll have to supply your own tools or call out a professional plumber. This is what you will find included with your purchase:

  • Chrome faucet
  • Led indicator that shows when to change the filter
  • Twist and seal filters
  • RO membrane
  • Sediment filter
  • Two carbon filters
  • 1x CR2 battery
  • Manual

Overview of Features

Besides the RO membrane, there is also a sediment filter as well as two carbon filters that help deal with rust, dust, chlorine and other contaminants. These extra filters allow you to get the most out of the RO membrane.

The filters can be changed every six months and their replacements can be purchased individually or in sets. The RO membrane is the most durable as it can last up to two years.

The unique design of the Brondell Circle only wastes a little over 2 gallons of water for every gallon filtered. This is an impressive improvement upon the average which is 24 gallons for most RO systems. It achieves this lower waste rate by using a flexible reservoir that reduces back pressure on the RO membrane.

Another benefit of the design is lower pressure drop, which means higher flow rate at the outlet. According to the manufacturer, many competing designs of similar capability have to rely on a built-in pump to achieve the high flow rate and low pressure drop of the Circle.

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Brondell H2O+ Installation 

The Brondell Circle may seem easy to install at first glance. Truth be told, while you don’t need technical skills to complete the installation, you do need a lot of patience and some tools lying around the house.

The Circle uses three different plumbing connectors. While the markings on the casing are self-explanatory as to which tube goes where, the water waste tube can cause you some problems. If your sink’s disposal tube is not equipped with a tiny hole that can connect it to the Circle unit, you will have to drill one.

Your sink should also be equipped with an additional 7/16 inch hole in order to install the faucet that comes with the Brondell. You don’t have to change your sink if you don’t have an opening because one can be drilled or cut. Again, this takes tools, some skill, and a lot of patience.

Luckily these are not tasks beyond the capabilities of any decent plumber so you could ask for professional help. If you’re set on tackling the DIY project then follow the step-by-step instructions in the manual. This video is also highly recommended:

There is also a first-time-use cycle you should follow. Alternate between running water, letting the tank fill up, and then empty for a while before you start drinking. You can find the correct intervals in the instructional video and it is important that you follow all the steps. Your water will not be clean enough to drink at first.


It’s hard to find any major drawbacks of the Brondell Circle apart from the low flow rate. Even if it is one of the best for RO systems without a built-in pump, it may not be enough for you. If that is the case, you can check out the APEC RO-90 filtration system.

This unit can handle up to 90 gallons per day at 60 psi which is almost twice as much as the Circle. It also uses multiple filtering layers to remove a wide range of contaminants. The downside of this system is its tricky installation process with even harder to fit tubes and connectors.


The Brondell H2O+ Circle is one of the best RO water filtration units you can get. Although it is a point-of-use design, the Circle still uses four separate filtering layers to clean water from sediments, microbes, bacteria, chemicals and heavy metals. It uses patented Brondell connectors and circuit technology to ensure higher flow rate than other non-electric RO filtering systems.

1 thought on “Brondell H2O+ Reverse Osmosis Water Filter System Review”

    I purchased a brondell under sink RO system and hooked it up to my bar sink but there is no water pressure coming from the RO system. Would this be because the RO system is defective or because it’s hooked up to a bar faucet instead of a typical filter faucet. I have high water pressure so I can rule that out. Can you help me with this? Thanks!


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