Whole-house water filter: pros and cons

Reading time: ~9 minutes

What is a whole-house water filter?

A central system usually consists of one or more large filter housings side by side. The first stage is almost always a sediment filter, which holds back sand, rust particles and other suspended material. This is often followed by an activated carbon filter, which reduces taste and odour compounds, among other things. For water from a private source, a UV lamp is sometimes added afterwards, which neutralises micro-organisms but needs electricity to do so.

Strictly speaking, a water softener falls outside this category. It does not remove contaminants but exchanges limescale, so it addresses a different problem. If you are unsure which of the two suits your situation, first read our article on the difference between a water softener and a water filter. A broader overview of the different types of water filters can be found on our explainer page.

Why do people choose a central filter?

A large share of the information about whole-house water filters comes from the United States. There, many water companies add chlorine or chloramine to tap water, so it is logical to want to remove that from shower water too. In the Netherlands it is different. According to the RIVM (the Dutch National Institute for Public Health and the Environment), our tap water contains no chlorine and its quality is among the best in the world. An important American argument for a central filter therefore hardly applies here.

There are still situations where a central filter makes sense. The RIVM reports that around 60 per cent of our drinking water is made from groundwater, and that the water companies treat it before it reaches your home. If you draw your water from a private well, you fall outside that system and must arrange treatment yourself. In older homes with loose rust or sand in the pipes, a sediment filter on the main supply can also protect appliances and taps.

What are the advantages of a whole-house water filter?

A central filter has real advantages, and they deserve an honest place in this comparison.

• Every tap in the home delivers filtered water, from the bathroom tap to the outdoor tap.
• A sediment filter catches sand and rust particles before they end up in aerators, shower heads and appliances.
• You do not need to fit and maintain separate filters on each tap, as there is one place for the whole home.
• For water from a private source, a central system with a UV stage forms the basis of a safe water supply.

The last point is the most important. If you rely on a private well, the question is not whether you need a central system, but which one. For those who simply receive drinking water from a water company, the comparison looks different.

What are the disadvantages of a central water filter?

Higher costs and installation by a professional

A central system is more expensive than a filter for a single tap. On Google Shopping on 4 November 2026, we saw complete whole-house systems at roughly €520 to €970, before installation. Because the filter goes on the main supply after the water meter, the pipe has to be opened and a bypass is often needed. That is a job for an installer.

Risk of pressure loss at every tap

All the water in the home has to pass through the filter. If the system is too small for your consumption, or a cartridge is full, you notice it at every tap and in the shower at the same time. How much water normally comes out of a tap is covered in our article on how many litres per hour come out of the tap.

More maintenance and attention to hygiene

A central cartridge processes the water for the whole household and therefore fills up faster. A filter left in place for too long works less well, and Milieu Centraal (a Dutch consumer organisation for environmental issues) warns that bacteria can grow on a filter if it is poorly maintained. That is a point of attention with any filter, but it weighs more heavily with a system that the shower water also passes through. Why standing water in pipes can be a risk is explained in legionella and water filters.

You mostly filter water that you do not drink

The biggest drawback lies not in the technology but in the proportion. The vast majority of the water that passes through a central filter disappears down the shower, the toilet and the washing machine. You can see this in the figures below.

How much of your water do you actually drink?

CBS (Statistics Netherlands) investigated, together with the drinking water sector, how much water the Dutch use at home. In 2021 the average was 129 litres per person per day. The breakdown shows where a central filter does its work.

Drinking and cooking account for 2.6 of the 129 litres, about 2 per cent. According to CBS, 1.1 litres of that goes on cups of tea, coffee and water, and the rest on pans. With a central filter you therefore mostly purify water that disappears down the drain. With an under-sink filter you purify exactly the part that ends up in your glass and in your food.

Whole-house water filter or under-sink filter?

The comparison below sets the two approaches side by side, with a filter jug as a third option. The column for the central filter describes systems in general, because the design varies greatly from brand to brand.

The comparison comes down to one question: which water do you want to change? If it is about your drinking water, the taste of your coffee and the water in your pan, then a filter at the tap where you drink is the targeted choice. How the different placements in the kitchen compare is covered in water filter system on or under the sink. Also take a look at our water filters for the kitchen sink if you want to look further.

At PureFilter we are regularly asked whether a central filter is not more convenient than a filter in the kitchen. Our answer is usually that it depends on your source: with drinking water from a water company, the kitchen is where a filter makes the biggest difference. An under-sink filter also works in combination with a Quooker, so that you get boiling and cold filtered water from the same setup. How to connect it is explained in our guide to connecting an under-sink filter yourself.

When is a central filter the right choice?

Honest advice works both ways. In these situations a whole-house water filter is a logical choice, or a good addition to a filter in the kitchen.

• You draw your water from a private well or source and are responsible for the treatment yourself.
• Visible sand, rust or other sediment comes out of several taps, and the cause in the pipework cannot be resolved quickly.
• You want to protect appliances and taps throughout the home against particles, regardless of what you drink.

Can you combine a central filter with an under-sink filter?

Yes, and in practice it is a commonly used setup. A simple sediment filter on the main supply catches the coarse material for the whole home, and a finer filter under the sink takes care of the drinking water. That way each filter does the job it is good at. If you mainly want to know which filter contributes most to your drinking water, read our article on which water filter is the healthiest.

Frequently asked questions

Conclusion

A whole-house water filter is a serious solution to a specific problem: water from a private source, or sediment that travels through the whole home. In that case the higher costs, the installation by a professional and the extra maintenance are weighed against the advantages. For most Dutch households with drinking water from a water company, it is different: of the 129 litres per person per day, only 2.6 litres go on drinking and cooking.

If you mainly want better-tasting and cleaner drinking water, you put the filter where you drink. An under-sink filter costs less, you connect it yourself, you take it with you when you move and it leaves the water pressure in the rest of the home untouched. You can find more about us and what we do at purefilter.nl.