Collection: Reverse Osmosis Systems

Reliable & high performance reverse osmosis filter systems

Water has unseen impurities in the form of bacteria, viruses, cysts, minerals, and other contaminants which make it unfit for drinking. Often the water is treated with fluoride and chlorine which removes most of these impurities leaving a noticeable taste and odour to the tap water. While it is a common problem for most households, it doesn’t make the most appealing way to quench your thirst. 

With an increasing number of problems in drinking water reported in Ireland every year, it becomes essential to improve the water quality in your home.

AC Slim Reverse Osmosis Unit

Culligan Aqua-Cleer Slim is an innovative direct flow reverse osmosis system that provides you with superior quality drinking water straight from your kitchen tap. With the direct flow technology, you no longer have to wait for a refreshing glass of drinking water. Culligan AC Slim provides great tasting water when you want it and for as long as you want it.

Designed and Made in Italy, Culligan AC Slim’s stylish and compact design leaves maximum possible space under your kitchen sink to keep your daily kitchen essentials. And more importantly, when you open your cabinet, you won’t be welcomed by a bunch of pipes falling out of your filtration system.

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Stella Reverse Osmosis System

Stella reverse osmosis system is one of our most popular water filtration systems. This super quality 5-stage RO system offers the very best filtration technology by removing virtually every impurity present in the water.

As reverse osmosis technology eliminates everything out of your water (including good minerals), you’re left with nothing in your water. This just isn’t the case with Stella reverse osmosis system, as it adds back essential minerals back into your water for that enhanced taste.

Designed and Made in Italy, Culligan AC Slim’s stylish and compact design leaves maximum possible space under your kitchen sink to keep your daily kitchen essentials. And more importantly, when you open your cabinet, you won’t be welcomed by a bunch of pipes falling out of your filtration system.

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Culligan G21 Reverse Osmosis System | Reverse Osmosis Systems | Celtic Water Solutions

Culligan G21 Reverse Osmosis System

Introducing the Culligan G21 Reverse Osmosis Filter – Your Gateway to Pure, Refreshing Water

Unlock the secret to crystal-clear, great-tasting water with the Culligan G21 Reverse Osmosis Filter. Designed with your health and satisfaction in mind, this high-capacity water filtration system guarantees a superior water experience for you and your family

Designed and Made in Italy, Culligan AC Slim’s stylish and compact design leaves maximum possible space under your kitchen sink to keep your daily kitchen essentials. And more importantly, when you open your cabinet, you won’t be welcomed by a bunch of pipes falling out of your filtration system.

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Culligan Compact Reverse Osmosis Unit with Remineraliser | Reverse Osmosis Systems | Celtic Water Solutions

Culligan Compact Reverse Osmosis Unit with Remineraliser

Introducing the Culligan Compact Reverse Osmosis Unit with Remineraliser – the ultimate solution for pristine, great-tasting water right at your fingertips. Engineered with precision and innovation, this cutting-edge system boasts a 5-stage reverse osmosis process, ensuring the highest standard of water purification.

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Our Reverse Osmosis systems remove

Enjoy Benefits of Reverse Osmosis Water

CWS reverse osmosis systems remove 99.9% contaminants found in tap water and deliver better, healthier water for your whole family to enjoy.

  • Multi-stage filtration that effectively removes chlorine, fluoride, bad taste, odour, organic compounds, cysts, and much more.
  • Unlimited great tasting filtered drinking water straight from the tap
  • Improved taste of food, tea, coffee, soups and everything that uses water
  • Space-saving design that fits easily under a kitchen sink
  • Advanced filtration for specific water problems such as reducing lead, chlorine and arsenic.
  • Perfect quality water for babies milk formula
  • Cost-effective, the daily cost of bottled water will no longer be a concern
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Say No to Bottled Water

All plastic bottles have to go somewhere. But many types of plastic cannot be recycled, and takes years to decompose. Single-use plastic bottles often end up in landfills or ocean beds, thus damaging the environment.

You may be shocked to know Ireland is the top producer of plastic waste in Europe; generating an average of 61kgs per person every year – almost double what the UK produces.

Filtered water is a simple and effective way to begin eliminating single-use plastic from the environment. Using filtered water means that much less plastic ends up in landfills to pollute the planet and fewer fossil fuels are utilized in the production of plastic bottles.

Be the change and do your part to help the environment.

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Savings from First Day

Buying bottled water is like pouring money down the drain. In fact it is nearly 2000 times the price of tap water.

Ditch the cost of buying single-use water bottles every week by switching to filtered water. Great tasting water from CWS reverse osmosis systems cost just 2c/litre which means you’ll be saving more than €600 every year on bottled water.

Filtering your drinking water with high-quality RO systems from Celtic Water Solutions can do more than save you hundreds of euros in bottled water costs, it can also guarantee pure, clean drinking water for you and your family.

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Easy Maintenance and Service

Keep your drinking water system in top-notch condition by changing the filters periodically. That’s the only ongoing cost associated with an RO unit.

An average family of 4-6 members with average drinking water use can expect the filters to last approximately nine months to one year.

Our service team will contact you when your service falls due, so you never miss a service.

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Why Choose Celtic Water Solutions for Reverse Osmosis Filtration Systems?

After many years selling RO Systems, we have listened to what our clients have relayed to us and what they felt was the most important thing in their eyes. We have obtained a clear and understandable message: Quality, Reliability and Efficiency. Our commitment is to continue supplying the best water filters, at the right price with an excellent service.

We are increasing our range of RO filters systems, to offer the ultimate selection of water filters to customers who are ready to invest in a kitchen appliance combining high water treatment performance, long durability and modern design.

Frequently Asked Questions


What is Reverse Osmosis?

Reverse osmosis is a water purification process that removes unwanted contaminants, solid substances, large molecules and other unwanted particles from water by using pressure to push it through a specialized membrane.

Installing a RO system delivers clean and filtered water straight from your kitchen tap. The semi-permeable membrane is designed to remove 99.9% of known contaminants from water. The additional filters remove odour and improve the taste of filtered water.

One of the biggest advantages of a reverse osmosis water filter filtration system is its efficiency. It is the best way to ensure clean and filtered water at a fraction of the cost of bottled water.

How do Reverse Osmosis systems work?

At CWS we provide an extensive range of reliable, highly specified reverse osmosis water filter systems. Reverse osmosis systems are used most commonly to purify drinking water by removing impurities that cause a bad taste, smell, or colour.

Reverse osmosis filtration systems employ a mixture of conventional cartridges and cross flow membranes with 3 to 5 filter cartridges combinations. They use a semi-permeable membrane which only allows water to pass through it and in the process eliminating all other contaminants.

Cross flow allows the membrane to continually clean itself off. As the fluid passes through the membrane, some of it continues downstream. This causes rejected and unwanted particles to be pushed away from the membrane.

RO requires a strong driving force to push the fluid through the membrane. Most reverse osmosis systems require a booster pump to force water through exceptionally small pore sizes in filter cartridges and membranes at high pressure. This ensures you only get pure drinking water.

What do RO filters remove?

Reverse osmosis systems remove dissolved minerals and metals such as aluminium, arsenic, barium, chlorine, chromium, copper, fluoride, magnesium, lead, mercury, nitrate, selenium, silver, sulphate and zinc.

They are also highly effective with microplastics, bad taste, colour and odour producing chemicals, particulates, total dissolved solids, turbidity and radium. When using appropriate active carbon pre-filtering (commonly included with most RO systems), additional treatment can also be provided for such volatile contaminants as benzene, MTBE, trichloroethylene, trihalomethanes (THMs) and radon.

Do Reverse Osmosis filters remove fluoride?

This is probably the most common concern we hear from potential customers and rightly so. Excessive fluoride exposure has been linked to several health issues.

An RO system is highly effective in the removal of fluoride from water as fluoride molecules are larger than water molecules. Again, this effectiveness still depends on proper care and maintenance of the RO filter.

Do Reverse Osmosis filters remove bacteria?

Reverse Osmosis technology is effective at filtering out most forms of bacteria such as cysts and cryptosporidium. However, it would not be able to remove E.Coli.  If you draw water from a private source, it would be best to install a UV filter to remove bacteria.

As with all filtration systems, however, for RO to effectively remove bacteria, the filter must be replaced regularly and installed correctly.

How much does it cost for a Reverse Osmosis system?

The price for a reverse osmosis filter depends on many factors such as brand, size, type of RO system and number of filtration stages. You can expect to pay anything around €300 – €600 for a good quality filtration system. In most cases, this price includes the charges of installing the unit.

What is the annual maintenance cost?

The filtration performance of cartridges decreases over time, which is why you must replace them as specified by the manufacturer. In general, most filter cartridges last 6 months but you may have to replace them sooner than the recommended replacement time depending on the quality of water in your home.

  • Sediment Filter – Average life of 6 months
  • Carbon Block Filter – Average life of 6 months
  • Granulated Activated Carbon (GAC) Filter – Average life of 6 months
  • RO Membrane – Average life of 12 months
  • Taste/ Odour Filter – Average life of 6-12 months

Replacing all these filters should cost you anywhere between €90-€170 depending on the type of your RO system.

CWS offers annual servicing for your water filter which consists of the replacement of all filters on your unit by one of our experienced technicians. Our office will remind you whenever you are due for servicing.

How long will my Reverse Osmosis system last?

If a reverse osmosis system is serviced and maintained as parts wear out (like the faucet and storage tank), the system can last easily for 10 to 15 years.

Do Reverse Osmosis systems remove minerals that are beneficial to health?

Reverse osmosis technology removes more than 95% of all the contaminants in water, including essential minerals present in drinking water. It can do so because their molecules are much larger than water molecules.

Our selection of reverse osmosis systems include systems with remineralizing filters which add back those healthy minerals which otherwise would have been lost in the filtration process.

Can I use Reverse Osmosis water to make baby formula milk?

In short, Yes. As RO water is free from harmful chemicals or impurities that may be hazardous to your baby’s health, it is safe to prepare baby’s formula using it.

Can I drink Reverse Osmosis filtered water if there is a boil water notice?

Reverse osmosis works best on microbiologically safe water. In an event of a boil water notice, you may continue to drink water from RO if the water is contaminated by cryptosporidium. For any other bacteria such as E.coli, the safest thing to do is use a UV filter.

After a boil water notice, it is recommended to get your water filter sanitized as it prevents the spread of bacteria in the tank.

Will a water softener harm the Reverse Osmosis system?

No, in fact, a water softener can help extend the life of the RO membrane. Calcium and magnesium (limescale) are two of the hardest minerals for the RO membrane to remove, and sodium (added to the water by the softener) is much easier on the membrane as it rejects 98% of all sodium in the water.