Coral Water Filters: 2 products compared

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Sale 27%
Brondell H20+ Coral UC300 Undercounter Water Filtration System

The Coral UC300 is an effective filtration system despite its small size. It’s not an RO system but it’s much more thorough with regards to removing contaminants compared to other small under sink water filters. Its design also looks very appealing and it comes with a faucet hence you get a complete filter system for your sink.

The Coral water filters are designed and produced by Brondell which is a tech company based in San Francisco, California. It was established in 2003 and since then they’ve been producing several different products that include water filtration systems, air purifiers, and bidets. 

The coral water filters are part of their renowned H20+ line of water filter systems and herein we have two models that we’re going to review to give you a better picture of what they offer.

1. Brondell H20+ Coral UC300 Undercounter Water Filtration System

Best Coral water filter
Sale 27%
Brondell H2O+ Coral UC300 Three-Stage Undercounter Water Filtration System – Water Purifier with...
  • THREE-STAGE FILTRATION: Brondell’s Coral Three-Stage filter set consists of a sediment filter, pre-carbon filter, and carbon block filter. Get rid of physical, chemical, and biological contaminants in your water while leaving behind beneficial minerals.
  • QUICK FILTER CHANGE: The Coral features a Twist & Seal system that makes changing the water filter a breeze while two "quick connect" hose connections make installing the Coral fast and easy.
  • HIGH CAPACITY FILTERS: Enjoy purified water all year round with these high capacity water filters. With a double O-ring filter seal to prevent leaks, these filters are designed to last 12 months with a 600-gallon capacity.


  • Effectively removes many different contaminants 
  • A great option for eliminating chloramines in the water
  • Filters have a decent lifespan of 12 months
  • It’s easy to install and to change the filters
  • A faucet is included in the package
  • Solidly built and comes with a one-year warranty


  • The faucet gets loose quickly

Filtration Performance 

The filtration performance of this Brondell H20+ system was quite impressive to many users. The unit is Gold Seal Certified by the WQA and has as well earned NSF/ANSI certification for standards 42, and 53. It’s also certified for NSF/ANSI standard 372 and CSA B483.1 for lead. 

The system utilizes a 3-stage filtration process that consists of a sediment filter, a pre-carbon filter, and a carbon block filter. These three stages do a thorough filtration job on the vast majority of common contaminants. They remove up to 99% of the contaminants in the water.

The sediment filter clears out all the floating particles including rust, dirt, and silt while the two carbon filters, on the other hand, get rid of the remaining contaminants. 

They are able to remove chlorine (taste and odor), commercial contaminants (MTBE), heavy metals (like lead and mercury), chemical contaminants such as pesticides (like Methoxychlor), herbicides (like Atrazine),  industrial chemicals (like Benzene ), VOCs, TDS, turbidity, asbestos and biological contaminants like cysts. 

In addition to that, the carbon filters do get rid of chloramines, which tend to be highly corrosive and difficult for most under sink water filters to remove because they are much more stable than chlorine. 

Most of the naturally occurring essential minerals (magnesium, calcium, and potassium) are retained in the water which helps improve its taste compared to water from under sink RO systems.

Many agreed that the filtered water from the unit has a great taste, better than the tap water or a single-filter system, and has no smell whatsoever. It does come out cloudy initially due to air bubbles but it’s only temporary as they dissipate rather quickly. 


The filters of the Coral UC300 are capable of processing up to 600 gallons of water without issues. Based on your water consumption they can last 9 to 12 months before requiring replacement. Users did attest that they actually last exactly one year, as advertised, unless though your water is absolutely filthy. 

The flow of water through the system is not bad (it’s around 0.5 GPM) which many did appreciate as you don’t wait for long to fill up a glass or other container with water. 


Installing this unit under the sink is pretty straightforward. The manual explains everything very well and the package includes all the necessary parts for the installation with standard plumbing. 

It comes with a faucet (with the hose already pre-installed), multiple adapters, and a t-valve that you have to add to your current t-valve for the cold water line. The filters are equally color-coded, hence there’s no room for error. 

The t-valve is all metal, not plastic. It’s sturdy and quite durable. The fasteners seem solid too including the mounting bracket for the filters. There are also no leaks as the system utilizes a double O-ring filter seal which helps to prevent water from leaking out.

Despite being a multi-stage system,  the Coral UC300 has a small footprint – it fits well under almost any under sink cabinet, taking very little space. You can easily mount it on one side and still have enough room for a trash can or cleaning supplies.

The included chrome faucet looks quite appealing and well made – it’s sturdy with no leaks or drips. It’s fairly simple to install, that is if you already have an existing hole drilled into your sink. The faucet is high enough to allow you to fill large containers without any issues.

The only downside is that it gets loose quickly, especially if you just hand tighten it. The only thing holding it in place is a plastic washer and a small metal nut that’s hard to tighten due to the confined space on the faucet’s underside – even when you try to tighten it, it still wobbles because of the plastic washer. 

The filters also require priming – users noted that the initial water from the system tends to have sediments and a weird oily look which only disappears after running water through the filters for some minutes after installation. 

Filter Replacement 

The filters are simple to change out thanks to their twist-and-seal design – you just twist off the cartridges to remove them and twist the new filters into place, and you’re done. No opening of larger canisters to access the filters.

Moreover, the faucet comes equipped with an integrated LED filter change indicator which conveniently reminds you when it’s time to replace the filters. 

Should you buy the Brondell H20+ Coral UC300?

The Coral UC300 is a good choice if you are looking for a small under-sink system that can remove a wide variety of contaminants or if you particularly want to remove chloramines from your water. 

2. Brondell UC100 H20+ Coral Under Counter Water Filtration System

Brondell UC100 H2O+ Coral Single-Stage Under counter Water Filtration System with Over 99% Lead...
  • Powerful certified carbon block filtration performance certified for more than 99% lead reduction
  • Designer chrome faucet with integrated LED filter change indicator (included)
  • Twist & Seal filter makes replacement a breeze

The UC100 is another Brondell under counter water filter that’s meant for small households that need an effective water filtration system. It’s a one-stage system but does a good job of filtering out most of the common contaminants present in water. It has a lot of positive reviews and the majority of users are very pleased with the taste and quality of water it produces. 


  • Very effective at getting rid of lead 
  • Gets rid of other common contaminants 
  • Simple to install and to replace the filters
  • Has double O-ring seal to prevent leaks
  • A faucet is provided
  • Lets you know when to replace the filter
  • Comes with a 1-year warranty


  • The filter has a slightly shorter lifespan
  • The adapters appear not to thread properly
  • The faucet drips a bit after shutting off

Filtration Performance 

Like the Coral UC300, this UC100 model has WQA (Water Quality Association) certification and it’s equally NSF/ANSI certified for standards 42, 53, and 372 as well as standard CSA B483.1.

The system features a single filtration process that utilizes a carbon block media that works exceptionally well to clear out over 99% of lead from the water. 

The media is also able to remove other common contaminants such as chlorine (taste and odor), chloramines, several heavy metals, and some chemical contaminants including herbicides (atrazine), pesticides, and VOCs.

The essential minerals are left untouched during the process, so the water has a better flavor than RO water or regular tap water. Users were generally pleased with how the water tasted and there were no reports of cloudiness or bubbles coming out. 


The filtration capacity is a bit on the lower end since the filter can only process up to 300 gallons of water before replacement which is similar to a 6-month lifespan. 

There’s no clogging issue, so it can last for the entire 6 months but if you have a large household or very dirt water, then it may last shorter than that, probably 2 to 3 months. Water flow is fairly fast at around 0.5 GPM, so no waiting for long to get the filtered water.

Installation and Maintenance 

The UC100 is straightforward to install provided that you already have a faucet hole drilled into your kitchen sink. The instructions are clear and the kit has all the things you need to install it.  The filter has a double O-ring seal hence you can expect zero leaks from it. 

One major complaint we noted is that the connectors seem poorly made despite being sturdy. There were those that mentioned that the ½” to ⅜” adapter doesn’t thread properly – you have to wrench the unit itself in order to ensure a tight fitting which can result in scratching the unit and weakening it.

The faucet is similar to that of the Coral UC300. It’s sturdy, has the same sleek chrome finish and it’s tall enough to give you sufficient clearance to fit a big container under it. A few users, however, did report that it sometimes drips a bit after shutting off the water – it releases a drop every 15 seconds for about a minute or two.

Replacing the filters is a breeze since it has the same twist and seal feature. You won’t also have to guess when to replace it because the faucet has an LED indicator light that will remind you when it’s time for a change out.  

Should you buy the Brondell H20+ Coral UC100?

If you have a small kitchen and want a reliable under sink water filter that won’t take up much space, then you can consider it. It’s also a nice option if your water is high on lead – it will remove all the lead from it. 

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