Home water purification: 7 methods compared

Reading time: ~12 minutes

What exactly is home water purification?

The word purification sounds heavier than what happens in a kitchen. The real purification takes place at the water company, which turns groundwater or surface water into drinking water and monitors that water all the way to your front door. What you do at home is lay a final layer on top: removing substances that meet the standard but that you would rather not have in your glass, or changing the taste.

That distinction matters, because it determines which expectation is realistic. Dutch tap water doesn’t come out of your tap as cloudy surface water that still has to be disinfected. It is treated, checked and cheap: the average price paid by customers in 2024 was €2.17 per cubic metre, including taxes, according to the key figures from Vewin. For a thousand litres you therefore pay a little more than two euros.

Home purification is therefore rarely about safety and almost always about three other things: taste, specific substances and convenience. If you want to know what exactly is in your glass after such a treatment, read what filtered water actually is. And if you first want to understand which water filter fits which purification question, that is the best place to start.

Is home water purification necessary in the Netherlands?

No, it isn’t necessary. That is the honest start of this article, and it is also the answer you will find everywhere. Milieu Centraal (an independent Dutch environmental information organisation) puts it bluntly: drinking water in the Netherlands is of good quality, and a water filter is therefore not necessary. The organisation even warns that a poorly maintained filter can worsen the quality, because bacteria can grow on it.

That criticism is justified, and we don’t avoid it. The figures support it too. Water companies check their sources daily, and of all measurements on the delivered water, 99.9 percent meet the standards, reports the industry association Vewin. Drinking water in the Netherlands is monitored more strictly than food. Anyone who installs a filter at home because they think the tap water is unsafe is solving a problem that doesn’t exist.

Even so, that is not the whole story, and for three reasons that can all be measured.

1. Meeting the standard is not the same as zero

The RIVM (the Dutch National Institute for Public Health and the Environment) established that Dutch drinking water meets the PFAS standards of the European Drinking Water Directive, and in the same study advised lowering the PFAS concentrations in a number of regions anyway. The reason: the health-based limit value of EFSA is considerably lower than the legal standard. Under the WHO guideline, drinking water may contribute at most 20 percent of that limit value, and in well over half of the measurements in drinking water made from river water that share is exceeded. For groundwater this applies to roughly one in ten measurements. The highest concentrations are in the west of the Netherlands.

That limit value from EFSA is 4.4 nanograms per kilogram of body weight per week, for four PFAS combined: PFOA, PFOS, PFNA and PFHxS. Through food and drinking water together, the Dutch are already above it. That is no reason for panic, but it is a reason why some people want to lower their own contribution. Which technique does something about it is explained in our overview of filtering PFAS and which technique works and on the page about water filters for PFAS.

2. Behind the water meter you are responsible yourself

Milieu Centraal makes that point explicitly: the water company delivers up to the meter, and behind it your own installation determines what happens. Lead pipes are the best-known example, especially risky for babies and children under seven. Standing water in the pipe, old copper fittings and a warm meter cupboard also change the water that ultimately comes out of your tap. That falls outside any statistic on network quality.

3. Taste is a legitimate reason

The last reason has nothing to do with safety. A chlorine smell after work on the network, a metallic taste, limescale floating on your tea: those are reasons to do something about your water, and they don’t need to be backed up with a health claim. At PureFilter we see that the vast majority of customers start for exactly that reason, and only afterwards start reading about PFAS. If you want to make that decision step by step, read whether you need a water filter.

The 7 methods for purifying water at home

There are seven ways that occur in Dutch households. They don’t all do the same thing, and that is exactly where most of the confusion lies.

1. Boiling

Boiling is the oldest method and the only one everyone already has at home. In the event of a boil-water advisory, the RIVM advises boiling drinking water for three minutes. After that, all pathogens are gone: bacteria, viruses and parasites. Showering, brushing your teeth and washing dishes with unboiled water is then still safe.

What boiling doesn’t do: it removes no PFAS, no heavy metals, no nitrate and no limescale. In fact, evaporation slightly increases the concentration of dissolved substances. Boiling is therefore a microbiological measure, not a chemical one. What else you need to do during a boil-water advisory is covered in our article on the boil-water advisory.

2. The water filter jug

The filter jug is the most popular entry-level product in the Netherlands. The cartridge usually contains activated carbon and an ion exchanger. The carbon binds chlorine, odour and part of the organic substances; the ion exchanger captures temporary hardness, so there is less limescale in your kettle. For taste, that works noticeably.

The weak spot is the rhythm. A jug cartridge lasts a few weeks, and if you keep using it for longer it not only loses its effect, it also becomes the breeding ground Milieu Centraal warns about. You also have to refill and wait. How that works out in practice is covered in our review of the Brita filter jug and in the overview of how often you should replace a water filter. A gravity filter is a larger version of the same idea, with ceramic or carbon elements; how that works is explained in our guide to gravity water filters.

3. The tap filter on the faucet

You screw a tap filter onto the faucet outlet. It is cheap and needs no work on the pipe, which makes it attractive in a rented home. The filter material is small, so contact time with the water is short and capacity is limited. For chlorine taste it works; for heavier claims the medium is usually too small. You can read the details in our piece on the tap filter on the faucet.

4. The carbon filter under the sink

A fixed filter sits on the cold water line, out of sight, and delivers filtered water from your existing tap without you having to refill anything. Because the cartridge is much larger than in a jug, the contact time is longer and the capacity higher. That is the difference between taste improvement and real reduction of chemical substances.

The PureFilter Mineral+ works like this: five filter layers, made up of a pre-filter, two layers of carbon fibre, Swedish Mineral Rock and a post-filter. In a test by Equinox Labs, an independent laboratory (2026), all 40 chemical substances tested were reduced, from 75 percent to 99.97 percent. Chlorine fell by 99.97 percent, PFAS by 83 to 85 percent, nitrate by 99 percent and fluoride by 94 percent. Lead, mercury, arsenic and cadmium came out below the detection limit. In the final step, Swedish Mineral Rock adds calcium, magnesium and potassium.

The filter housing costs €149.00 including the first filter. A separate replacement filter is €65.00 and lasts up to 12 months for 1 to 3 people, or up to 6 months for 4 or more. If you don’t want to think about it, it can be done through the Filter Plan for €48.00 per year for 1 to 3 people. Installation takes 5 to 10 minutes and requires one water pump plier, no plumber. You can find an overview of all fixed options at the water filters you can use to purify at home.

5. Reverse osmosis

Reverse osmosis forces water under pressure through a membrane with extremely small pores. It is the most thorough method feasible at home and holds back almost everything, including dissolved salts. That is also where the drawbacks lie: the system flushes part of the water away as concentrate, it removes the minerals from your water, and a good system needs space and a connection to the drain. Many systems therefore add a remineralisation stage afterwards. Whether that water is healthier or simply flatter, we looked into in osmosis water: healthy or unhealthy.

6. UV-C

A UV-C lamp irradiates the water and makes micro-organisms harmless, without chemicals and without changing the taste. Alongside boiling, it is the only home method that does anything against bacteria and viruses. But UV removes nothing from the water: PFAS, lead, nitrate and limescale pass straight through. In a Dutch household with normal tap water, UV therefore solves a problem that rarely exists. The question of what a filter does and doesn’t do against bacteria is covered in legionella and tap water.

7. Water purification tablets

Tablets based on chlorine or silver kill micro-organisms and are intended for emergencies and travel, not for daily use. They leave a taste, only work after a waiting time of usually 30 minutes and do nothing about chemical contaminants. For a pantry they make sense, for your kitchen they don’t.

What home water purification does deliver

If safety isn’t the argument, what is? Four things, and all four are concrete.

• Taste and smell: chlorine is the most commonly reported complaint after work on the network. Activated carbon tackles that directly; in the Equinox Labs test, chlorine fell by 99.97 percent.
• Less bottled water: according to Milieu Centraal, the climate impact of one glass of bottled water is comparable to that of about seventy glasses of tap water. Anyone who replaces bottles with filtered tap water wins on weight, waste and cost at the same time.
• Your own pipes: what happens behind the water meter is not caught by any water company for you. A filter at the last point before the tap is the only place where you still have any influence over that.
• A lower personal PFAS contribution: not because the water fails the standard, but because total exposure, according to the RIVM, is already above the EFSA limit value and drinking water is part of that.

At PureFilter we see that customers mostly come in through the first point and stay for the third: they order for the taste and keep the filter because they don’t miss refilling jugs.

The points critics rightly raise

There are four objections to home purification that hold up. Anyone choosing a method should know all four.

A neglected filter becomes a problem

This is the critics’ strongest argument, and it is true. Activated carbon is moist, nutrient-rich and lukewarm: ideal conditions for bacterial growth once the filter is saturated and you leave it in place. Milieu Centraal explicitly names this as a reason not to use a filter. The counter-argument is not that it is nonsense, but that it is a maintenance question: a replacement schedule you actually keep is part of the purchase. For a jug cartridge that means every few weeks, for a fixed filter up to 12 months for 1 to 3 people or up to 6 months for 4 or more.

A saturated carbon block can release substances

When the carbon is full, it doesn’t just stop binding, it can also release stored substances again. That is the same physics that makes the filter work, in reverse. Again: no reason not to filter, but a reason to replace on time and never go beyond the stated capacity.

A carbon filter does not disinfect

No household carbon filter is a replacement for a boil-water advisory. The PureFilter Mineral+ is made for Dutch tap water: it makes the water better and tastier, but it does not disinfect. If a boil-water advisory is issued, you boil, even with a filter under your sink.

Osmosis removes the good things too

Reverse osmosis makes no distinction between PFAS and magnesium. Anyone who chooses that route without a remineralisation step is left with bare water that tastes flat. That is not a health disaster, but it is the opposite of what most people are looking for when they want to make their water taste better.

And one objection that is wrong

A water filter is not a water softener. The hardness of your water hardly changes, and it doesn’t need to: according to Milieu Centraal, almost two thirds of Dutch municipalities have soft water. Anyone who wants less limescale needs a different solution, not a drinking water filter.

Which method removes what from your water?

This table sets the seven methods side by side on what they demonstrably do. A dash means: this method is not meant for that.

What stands out when you read the columns from top to bottom: no single method does everything. Boiling and UV deal with the living part, carbon and osmosis with the chemical part. That is the core of the choice, and it is also why the question “what is the best water purification system” has no single answer without knowing what you want it for. You can find a comparison on health in what the healthiest water filter is; this article compares methods, that article compares filter types.

Which method suits your situation?

Four situations cover almost all Dutch households.

• You only want the chlorine taste gone: a filter jug or a tap filter is enough, provided you replace the cartridge on time. Going further makes no sense.
• You drink tap water every day and want to reduce chemical substances: a fixed carbon filter under the sink is then the logical step. You refill nothing, the capacity is high and the water comes from your own tap.
• You want maximum reduction and minerals don’t matter to you: reverse osmosis, with space under your sink and a drain connection.
• You are looking for a solution for emergencies: tablets or a portable filter in the pantry, alongside the option of boiling.

If you are torn between fixed systems, our overview of the best water filters side by side and the explanation of how a water filter works will help. And if you live in a rented home or an apartment, look at what fits under a sink before you order. What we supply ourselves and why, you can read on the PureFilter website.

Frequently asked questions

Conclusion

Home water purification is not a necessity in the Netherlands and is not recommended by Milieu Centraal either. That is the honest state of affairs, and any article that glosses over it is selling you something. At the same time, there are three reasons why people do it anyway that hold up under scrutiny: taste, your own pipes behind the water meter, and lowering your own PFAS contribution in a country where total exposure, according to the RIVM, is already above the EFSA limit value.

The practical conclusion is that the method must fit the goal. Boiling and UV deal with the living part of the water, activated carbon and reverse osmosis with the chemical part, and tablets belong in an emergency kit and not in a kitchen. If you choose for daily drinking water, a fixed carbon filter is the only option that combines high capacity, long lifespan and retention of minerals, provided you replace it on time. That last point is not a detail, it is the condition.