Let me be honest with you for a moment. When I first started looking into water filtration, my reaction was the same as most people I talk to: "Is this really necessary? We have treated mains water. It goes through regulation. It must be fine."
Then I actually started looking at what's in it.
Chlorine. Lead traces from old pipework. Microplastics. Nitrates. PFAS, also known as forever chemicals, which the European Environment Agency has described as one of the most widespread and persistent contamination threats to drinking water across the continent. A 2023 study published in the journal Environmental Science and Technology found that PFAS compounds were detected in the blood of the vast majority of Europeans tested, with drinking water identified as one of the primary exposure routes.
And that was the moment I stopped being sceptical and started paying close attention.
If you have children, this matters even more. Children's bodies absorb contaminants at a higher rate than adults. What is "within regulatory limits" for a healthy adult is not necessarily the standard you want to hold your family's daily drinking water to. I certainly don't.
So the question I kept asking myself, and the one I hear from so many families across Ireland and the UK every week, is this: Is a Reverse Osmosis water filter actually worth the investment?
The answer, after years of research, conversations with water treatment specialists, and speaking with thousands of families who have made the switch, is a clear and confident yes. Let me show you exactly why.
What Reverse Osmosis Actually Does to Your Water
Reverse Osmosis, or RO, works by forcing water through a semi-permeable membrane so fine that it removes up to 99.8% of dissolved contaminants. We are not talking about the basic carbon filtration you find in a jug filter. We are talking about the removal of chlorine, chloramines, lead, fluoride, nitrates, PFAS, microplastics, pesticides, heavy metals, bacteria, and more.
A standard jug filter like a Brita is designed to reduce chlorine and improve taste. That is about where its job ends. It does not remove lead. It does not remove PFAS. It does not remove nitrates. And its filtration capacity drops significantly after just a few days of use if you forget to change it, which most of us do.
The gap between a jug filter and a Reverse Osmosis system is not a small one. It is the difference between slightly better water and genuinely purified water.
A note that often comes up: Reverse Osmosis does remove naturally occurring minerals like calcium and magnesium alongside the contaminants. This is worth knowing, but it is also worth keeping in perspective. The scientific consensus is that we obtain the vast majority of our daily mineral intake through food, not water. And where it matters, the best modern RO systems can include a remineralisation stage to add beneficial minerals back in after filtration, giving you the best of both worlds.
The Cost Question: What Is Your Family Really Spending on Water?
This is where things get very real, very quickly.
Think about a family of four who drinks bottled water instead of tap water. Reaching the recommended daily intake of two litres per person means getting through eight litres a day as a family. At Irish supermarket prices, that works out to somewhere in the region of €1,300 to €1,500 every single year, just on bottled water. That does not count the environmental cost of the plastic, or the inconvenience of carrying heavy multipacks home every week.
A quality Reverse Osmosis system like the ArkkZ from Renewell Water has a retail price of €439. The annual filter replacement, which you can do yourself in under a minute without calling a technician, costs a fraction of what you are currently handing to the supermarket. By the end of year one, the system has paid for itself and then some. By year two and beyond, you are simply saving money while drinking better water every day.
The maths is not even close.
The Maintenance Myth: It Is Easier Than You Think
One of the most common hesitations I hear about Reverse Osmosis systems is around maintenance. People picture annual callouts, expensive technician visits, complicated filter setups that require a professional to touch.
With older, traditional RO systems that use a pressurised storage tank, that concern has some basis in reality. Those units have more components, take up more under-sink space, and can require professional servicing to keep running properly.
But modern tankless systems have changed this entirely.
The ArkkZ, for example, is a compact, tankless direct-flow system that delivers water on demand without any storage tank. Its annual filter change is genuinely DIY. No tools required. No technician booking. No waiting. The entire process takes around 30 seconds. Renewell Water ships your annual filters directly to your door, and you simply swap them over yourself. That is it. One service event per year, done by you, in under a minute.
For busy families, that kind of simplicity is not a small thing.
What About Minerals? The Question Worth Addressing Honestly
Some people worry that drinking demineralised RO water is unhealthy. It is a fair question and one that deserves a straight answer.
The World Health Organisation has noted that very low mineral water, consumed over a long period, is not ideal in isolation. However, research consistently shows that we get the overwhelming majority of our essential minerals through food, not water. The minerals in tap water contribute only a small percentage of our daily intake.
That said, if this is something you want to address, it is easy to do so. Many RO systems, including options available through Renewell Water, can incorporate a remineralisation stage that adds calcium and magnesium back into the water after filtration. You get purified water with a balanced mineral profile. The concern goes away completely.
Who Is a Reverse Osmosis Filter Right For?
Honestly? Most Irish and UK households. But particularly if you:
- are regularly buying bottled water for drinking and cooking, and want to stop spending that money every week
- have children at home and want full confidence in the water they drink
- live in an area with hard water, older pipework, or a history of boil notices
- have noticed a chlorine taste or smell from your tap
- are health-conscious and want to reduce your family's long-term exposure to PFAS and other persistent chemicals
The Best Reverse Osmosis Filters in Ireland: A Comparison
There are a number of RO systems available in the Irish market right now. Here is an honest comparison of the main options, so you can make an informed decision.
🥇 No. 1 — ArkkZ Water Filtration System by Renewell Water
Price: €439 | renewellwater.com
The ArkkZ is Renewell Water's flagship drinking water system and, in our view, the best all-round RO option available in Ireland right now. It is a tankless, direct-flow system delivering up to 800 GPD of purified water on demand, with no waiting for a tank to refill.
What sets it apart is the combination of filtration performance, compact design, and effortless maintenance. The DIY annual filter change takes under 60 seconds and requires no tools or professional visits. It fits neatly under any standard kitchen sink and pairs beautifully with Renewell's range of tri-flow and four-way kitchen taps.
Renewell Water is Ireland's Number 1 rated water filtration company, with over 2,000 verified reviews and 24 years of experience. Their service reputation is second to none. You can read what customers are saying at renewellwater.com/reviews.
Best for: Families who prefers a local business and want high-performance filtration, simple self-service maintenance, and a compact modern design at a fair price.
Strengths: Tankless design, 800 GPD flow, 60-second DIY filter change, exceptional after-sales service, Ireland's top-rated brand.
🥈 No. 2 — Culligan DF RO by Celtic Water Solutions (Culligan)
Price: €595 | celticwatersolutions.ie
The Culligan DF RO is a solid direct-flow system with good build quality and NSF-certified components. Celtic Water Solutions, now rebranded as Culligan Home Ireland, has been in the Irish market for some time and has a respectable service network.
At €595, it sits at a noticeably higher price point than the ArkkZ for comparable direct-flow performance. Filter servicing typically requires a technician visit, which adds to the ongoing cost of ownership. If you prefer a brand with a familiar name and are comfortable paying for professional annual servicing, this is a reliable option.
Best for: Customers who prefer a known global brand.
Strengths: Reputable brand behind the product, good build quality.
Considerations: Bad service Reviews and Higher upfront cost, ongoing service costs to factor in.
🥉 No. 3 — Standard PRO Reverse Osmosis with Mineralisation by Cleanwater.ie
Price: Lower entry point | cleanwater.ie
The Cleanwater.ie Standard PRO is an Ecosoft-based unit with a remineralisation stage, which is a plus. However, it is a traditional tank model, meaning it uses a pressurised plastic storage tank that takes up a significant amount of under-sink space and limits the volume of water available at any one time to around 7 litres of usable capacity.
Production is limited to approximately 190 litres per day on a 50 GPD membrane, which for a family of four drinking, cooking, and making hot drinks throughout the day can feel restrictive during peak times. Because of the tank design, servicing requires more components to manage, and the annual maintenance is more involved than a modern tankless system.
Best for: Households on a tighter budget who are comfortable with a traditional tank-based setup.
Strengths: Lower upfront price, includes mineralisation, Ecosoft is a quality manufacturer.
Considerations: Traditional models waste more water and the tank design uses more under-sink space, lower daily water output, more complex servicing.
My Final Considerations
A Reverse Osmosis water filter is not a luxury. For any family that is regularly spending money on bottled water, concerned about what is in their tap water, or simply wants the confidence of knowing what their children are drinking every day, it is one of the smartest investments you can make for your home.
The ArkkZ by Renewell Water delivers the filtration performance you need, the simplicity of a one-minute annual self-service, and the backing of Ireland's most trusted water filtration brand. At €439, it pays for itself in under a year compared to a typical bottled water habit, and then it just keeps delivering pure water, day after day, from your own tap.
If you would like to find out more, explore the ArkkZ and read what thousands of Irish families have to say about it at renewellwater.com/reviews.
And guys, remember: