Water Filters Explained: Types, Reasons and What They Do
In short. Drinking water in the EU and the Netherlands is regulated under strict rules and is among the safest in the world, so a filter is generally a matter of preference rather than safety. People mostly filter for taste, for the smell of chlorine or for limescale and hardness. Activated carbon improves taste and odour, while reverse osmosis removes a much wider range of dissolved substances. No filter is best for everyone, and every filter needs maintenance. This is information, not medical advice.
Is tap water in the Netherlands and the EU safe to drink?
Yes. In the European Union, including the Netherlands, drinking water is governed by the EU Drinking Water Directive and national rules, and it is tested regularly before it reaches your tap. By international standards it is among the safest drinking water in the world. A water filter is therefore generally a matter of personal preference, for example taste or hardness, and not a way to make unsafe water safe. This article does not claim that tap water is dangerous or contaminated; it simply explains how filters work for people who prefer to use one.
Because regulated tap water already meets strict quality requirements, the honest reasons to filter are mostly about comfort and taste. That is the lens we use throughout this guide.
Why do people choose to filter their water?
The reasons are practical and personal rather than safety scares. The most common ones are taste, the smell of chlorine that some water companies add for hygiene, and limescale from hard water that can leave deposits in kettles and on glassware. Some people simply prefer the taste of filtered water, or like having chilled, filtered water on hand. None of these reasons means the underlying tap water is harmful; they are about preference and convenience.
What are the main types of water filters?
Filters differ in what they target, how they work and how much maintenance they need. The overview below is for information.
| Filter type | How it works | General characteristic (informative) |
|---|---|---|
| Activated carbon (jug or tap) | Adsorbs certain substances onto carbon | Improves taste and reduces chlorine odour, simple to use |
| Reverse osmosis | Forces water through a fine membrane | Removes a wide range of dissolved substances, uses more water |
| Ion exchange or water softener | Swaps hardness minerals for others | Reduces limescale, changes the mineral balance of the water |
| Mechanical or sediment filter | Physically traps particles | Catches sediment and fine particles, often a pre-filter |
| UV treatment | Uses ultraviolet light | Targets micro-organisms, does not change taste or minerals |
No single filter is best in every situation. Which one suits you depends on your goal, your water and how much maintenance you want.
What can a water filter not do?
A filter is a tool with limits. A simple carbon jug mainly improves taste and odour and does not remove everything dissolved in water. Reverse osmosis removes much more, but it also strips out minerals and produces some waste water. Softeners reduce limescale but change the mineral balance and are not designed to purify. Importantly, in a region with safe regulated tap water, a filter is an upgrade in taste or comfort, not a fix for a safety problem that does not exist. Always follow the manufacturer instructions for the specific device.
How do you maintain a water filter?
- Replace cartridges on schedule, because a saturated filter works less well and can become a place where bacteria grow.
- Follow the manufacturer instructions for replacement intervals, cleaning and storage.
- Keep the system clean and use filtered water reasonably fresh rather than letting it stand for long periods.
- Match the filter to your goal, for example carbon for taste or a softener for limescale, instead of expecting one device to do everything.
Frequently asked questions
Do I need a water filter if tap water is already safe?
No, not for safety. In the EU and the Netherlands, regulated tap water already meets strict quality standards. A filter is a personal choice for taste, for the smell of chlorine or for limescale, not a requirement to make safe water safe.
Does a water filter remove healthy minerals?
It depends on the type. A simple carbon filter mainly affects taste and chlorine and leaves most minerals in place. Reverse osmosis removes a much wider range of dissolved substances, including minerals, which is why some systems add minerals back afterwards.
What is the difference between activated carbon and reverse osmosis?
Activated carbon adsorbs certain substances and mainly improves taste and odour. Reverse osmosis forces water through a fine membrane and removes a far wider range of dissolved substances, but it is more complex and uses more water. They serve different goals.
Does filtered water taste better?
Many people find that it does, especially when a carbon filter reduces the smell or taste of chlorine. Taste is subjective, so this is a matter of preference rather than a measure of safety.
How often should I change a filter cartridge?
Follow the interval stated by the manufacturer for your device, since it depends on the cartridge and your usage. A cartridge that is used beyond its life works less well, so timely replacement matters for both taste and hygiene.
References
- Directive (EU) 2020/2184 of the European Parliament and of the Council on the quality of water intended for human consumption (recast). eur-lex.europa.eu
- World Health Organization. Guidelines for drinking-water quality. who.int
- European Environment Agency. Information on drinking water quality in Europe. eea.europa.eu
Written by the NOTFORTOMORROW Editorial Team. How we research: we base factual statements on official EU regulation and on recognised water-quality bodies, we cite our sources, and we date our reviews. This article is information, not medical advice; consult a qualified professional about your situation. You can find our supplements at our full product range. Last reviewed: 2026-06-06.