Choosing the best reverse osmosis system

Reading time: ~9 minutes

What is a reverse osmosis system?

A reverse osmosis system (RO system) pushes tap water under pressure through a semi-permeable membrane. That membrane only allows water molecules through and blocks up to 99% of dissolved substances. This leaves you with pure, delicious drinking water, without the contaminants you don't want in your glass. If you want to know exactly how each step works, read our explanation on how reverse osmosis works.

Dutch tap water is safe and of high quality, as confirmed by Milieu Centraal. Nevertheless, more and more households are choosing an RO system for extra certainty: the RIVM advises reducing total PFAS intake, and reverse osmosis is one of the few techniques that effectively removes these substances from your drinking water. Add to that the taste: less limescale means better-tasting water and less buildup in your kettle.

What should you look for when choosing?

Not every system is the same. At PureAqua, we see that customers primarily choose based on five criteria. Go through them before ordering anything to avoid a bad purchase.

1. Purity

What does it filter? A strong membrane removes up to 99% of PFAS, microplastics, heavy metals, pharmaceutical residues, and limescale. Pay attention to the stated filtration rate and independent standards such as NSF/ANSI 58, the standard that specifically applies to reverse osmosis.

2. Mineral filter

Are the minerals added back? Pure osmosis water is very clean but tastes flat because beneficial minerals are also removed. A good system has a mineral filter that adds calcium and magnesium back so that your water tastes fresh and well-rounded. You can read more about this in our article on what you use osmosis water for.

3. Flow and storage

How fast do you get water? Systems with a pressure tank or direct flow deliver a full glass faster. For a family, a smooth flow is nice, especially if multiple people are drawing water at the same time. You can read which filter stages are involved in our explanation of which filter stages an osmosis filter consists of.

4. Installation and space

Does it fit under your sink? An under-sink system is invisible but requires space and a connection. If you don't have that space, or if you are renting, then a system on the counter without installation is more convenient.

5. Maintenance and peace of mind

Who handles the filters? Changing filters is part of it. It's nice if filter replacement, installation, and warranty are included in a package or subscription, so you don't have to worry about it yourself. If you are doubting between buying and a monthly fee, read when a subscription turns out cheaper than purchasing.

Under the sink or on the counter?

Broadly, there are two routes to pure water via reverse osmosis. Which one is best depends on your kitchen and your wishes.

Under-sink system with its own faucet

A complete system like The Source sits invisibly under your sink and delivers pure water via a separate, stylish pure-water faucet. Ideal if you want a sleek kitchen and draw a lot of water daily. A PureAqua specialist installs it in 30 to 60 minutes.

System on the counter (Countertop RO)

A Countertop RO stands loose on your counter and works plug and play, without installation. You refill it or simply connect it. Perfect for renters, small kitchens, or if you want to remain flexible. Want to know more? Read how to get osmosis water without installation.

Systems and brands compared

If you search for "the top 5 water filters," you'll mainly find individual products online. More important than just a brand name is which type of system suits you. Below, we list the most well-known brands and system types alongside PureAqua, with their purification and an indicative price. Prices and specifications vary per version and provider, so always check with the source before ordering.

Most brands provide a strong membrane that purifies up to around 99%; the difference lies primarily in service and convenience. Standalone systems with a booster pump and brands like Waterdrop or AquaTru are competitively priced, but you install and maintain them yourself. BWT offers more guidance. PureAqua is deliberately on the service side: installation by a specialist, a mineral filter for taste, 100 days trial, 2 years all-in warranty, and a subscription that automatically handles filter replacement. If you want to tinker yourself and keep a close eye on the price, then a budget brand is logical; if you want pure water without worrying about it, then you pay at PureAqua for the peace of mind. A filter pitcher is the cheapest option but doesn't remove PFAS or heavy metals the way reverse osmosis does; if you are doubting between filter types, first compare water filter, water purifier, and reverse osmosis side by side.

What does a reverse osmosis system cost?

The costs consist of two parts: the purchase and annual maintenance. Standalone systems with a booster pump are available from around 247 to 549 euros, but then you arrange installation and filters yourself. A complete under-sink system with service starts at approximately 699 euros, or you spread the costs via a subscription of 29 euros per month in which installation and filters are included.

For maintenance, count on filter replacement. A set of pre-filters and post-filters costs roughly 100 to 150 euros per year; the membrane usually lasts 2 to 3 years. If you calculate that per liter, pure water from your own tap is considerably cheaper than bottled water from the supermarket. At PureAqua, the subscription keeps those costs predictable, and the service ensures that your filters are replaced on time. If you want to tinker yourself and keep a close eye on the price, then a budget brand is logical; if you want pure water without worrying about it, then you pay at PureAqua for the convenience.

Disadvantages and how to solve them

To be fair: reverse osmosis also has points of attention. The good news is that a modern system largely solves them. We list all the downsides of reverse osmosis separately, but these are the most important ones.

• Minerals removed: RO also removes beneficial minerals. A mineral filter adds calcium and magnesium back, so with the right setup, this is not a problem.
• Water consumption: rinsing water is created during filtration. Efficient membranes and a good pressure ratio limit that loss significantly.
• Space: an under-sink system requires space under the sink. If you don't have that, a compact Countertop RO is the solution.

Installation and maintenance

An under-sink system is connected to your cold water line and gets its own faucet on the counter. A PureAqua specialist handles this expertly, usually within an hour. Prefer to do it yourself? Then there is a DIY installation kit with John Guest couplings. A Countertop RO requires no installation: connect or fill it, and you tap pure water immediately.

Maintenance is simple: replace filters on time and check occasionally. With a subscription or service package, the correct filters are automatically sent to your home so your system continues to deliver pure water for years. This way, you keep 100 days of trial and 2 years of warranty as a safety net.

Frequently asked questions

Conclusion

The best reverse osmosis system is not necessarily the most expensive or the best-known, but the system that fits your kitchen, your water consumption, and the level of convenience you desire. Pay attention to purity up to 99%, a mineral filter for taste, a smooth flow rate, and whether installation and filter service are included. If you choose an under-sink system with its own tap and full service, The Source is the logical choice; if you want to remain flexible without installation, the Countertop RO is ideal; and if you are mainly looking for a sharp price, a separate system with a pressure pump is worth considering. This way, you drink pure, tasty water from your own tap every day.