Water filter on the tap: does a tap filter work? (2026)

Reading time: ~11 minutes

A faucet water filter seems like the easiest way to get cleaner, better-tasting tap water: just screw an attachment onto the faucet, and you're done. But does such a faucet filter really work, and does it filter out the substances you're concerned about, such as PFAS, lead, and microplastics? In this guide, we explain what a faucet water filter does, what types there are, and when an under-sink filter is the smarter choice.

1. What is a faucet water filter?

Most faucet filters use activated carbon to improve chlorine, taste, and odor and to trap coarse particles such as sand and rust. Some models also claim to remove part of the lime, heavy metals, or microplastics. Performance varies greatly by brand and price range.

Important difference with an inline system: a faucet water filter is visibly attached to your faucet and filters only that one tap point. An under-sink filter is hidden in the cabinet and provides filtered water through your existing faucet.

2. Why do people choose a faucet filter?

Dutch tap water is among the cleanest in the world and meets strict standards, according to Vewin and RIVM. Nevertheless, more and more households are opting for extra filtration. The main reasons:

• Taste and odor: chlorine and a slight metallic taste disappear, making water taste fresher.
• Concerns about contaminants: PFAS, microplastics, drug residues, and heavy metals regularly make headlines. Milieu Centraal confirms that traces of these occur in the environment.
• Old pipes: in houses built before 1960, lead from internal pipes can dissolve, especially if the water has been standing for a long time.
• Convenience and sustainability: no more lugging bottles and less plastic waste.

At PureFilter, we see that customers primarily choose filtration because they want both better-tasting water and the assurance that unwanted substances are removed. A faucet water filter is a logical first step, but not always the most complete.

3. What types of faucet water filters are there?

Faucet spout attachment filter

The classic faucet filter that you screw onto the faucet, such as models from Brita, TAPP, or PUR. Price typically 35 to 60 euros, with replacement cartridges from 15 to 30 euros that you replace every 2 to 3 months. Capacity is between 500 and 1,200 liters per cartridge.

Filter pitcher (pitcher on the countertop)

Strictly speaking, not a faucet filter, but the most popular alternative. You fill a pitcher that filters through a carbon cartridge. Capacity is limited to about 150 to 200 liters per cartridge, and you have to refill constantly.

Under-sink filter (inline)

Not an attachment filter, but the full-fledged alternative. The filter is invisibly placed in the kitchen cabinet on the cold water line and delivers filtered water through your existing faucet. A certified inline filter such as the PureFilter Mineral+ has a capacity of 15,000 to 20,000 liters, 15 to 40 times more than an attachment filter.

4. Advantages of a faucet water filter

• Quick to install: an attachment filter screws onto the faucet in a few minutes, without tools.
• Better taste: chlorine and odors are reduced, making the water fresher.
• Low initial price: a simple faucet filter costs 35 to 60 euros.
• Less bottled water: you no longer fill bottles and produce less plastic waste.
• Direct switch: many models allow you to switch between filtered drinking water and unfiltered water for washing dishes.

5. Points of attention and disadvantages

A faucet water filter has a number of limitations that you should be aware of beforehand:

• Small capacity: with 500 to 1,200 liters per cartridge, replacement is necessary every 2 to 3 months. Annually, filter costs can amount to 60 to 120 euros.
• Limited filtration: many attachment filters primarily focus on chlorine and taste. Certification for PFAS, arsenic, or hexavalent chromium is often lacking. Therefore, pay attention to independent NSF certification.
• Bacterial growth when saturated: a full or overused filter can promote bacterial growth. Investigative journalism program Pointer warned that a poorly maintained filter can even make the water more unsuitable. Always replace the cartridge on time.
• Lower flow rate: due to the small filter housing, water flows more slowly from the faucet.
• Visible and sometimes in the way: the attachment makes the faucet longer and does not fit every model.
• No mineralization: an attachment filter does not add minerals. In aggressive systems like reverse osmosis, calcium and magnesium disappear completely.

6. Comparison table: faucet filter vs. alternatives

7. Faucet water filter or under-sink filter: which is better?

For those who only want to improve taste and are rarely home, a simple faucet water filter is fine. If you really want to be sure that PFAS, microplastics, and heavy metals are removed, while retaining healthy minerals, then a certified under-sink filter is the better investment.

Calculate it simply. An attachment filter quickly costs 60 to 120 euros per year for cartridges and delivers a maximum of 1,200 liters at a time. The PureFilter Mineral+ costs a one-time €149.90 including filter, after which a replacement filter from €49.90 is good for 15,000 to 20,000 liters, or about €0.14 per day. Moreover, it removes more than 100 contaminants and adds calcium, magnesium, and potassium via Swedish Mineral Rock™.

Installation takes 5 to 10 minutes on the cold water line, without a plumber or tools. The filter remains invisible in the cabinet, and you simply drink from your existing faucet. Want to know more about the options? Check out our explanation of the under-sink water filter or the best water filter page.

8. Buying advice: which choice suits you?

• You mainly want better-tasting water and a low initial price: a simple faucet attachment filter suffices, provided you replace the cartridge every 2 to 3 months.
• You are concerned about PFAS, lead, or microplastics: choose an NSF 53-certified under-sink filter that demonstrably removes these substances.
• You want pure water and to retain minerals: the PureFilter Mineral+ purifies and mineralizes, unique among inline filters.
• You rent and cannot install anything permanently: read our guide on a water filter in a rental home; an attachment filter or our easy-to-install/remove inline solution can then offer a solution.

9. Frequently asked questions about a faucet water filter

10. Conclusion

A tap water filter is a cheap and quick way to improve the taste of tap water and retain coarse particles. The downside is its small capacity, limited filtration, and the risk of bacterial growth if not replaced on time. For those who want certainty about PFAS, heavy metals, and microplastics, a simple on-tap filter often falls short.

A certified under-sink filter combines the convenience of your existing tap with a much larger capacity and broader filtration. The PureFilter Mineral+ is NSF-certified (42, 53, 61, and 372), removes over 100 contaminants, and adds minerals via Swedish Mineral Rock™. Installation takes 5 to 10 minutes, and at approximately €0.14 per day, it is more economical than bottled water. Want to know more? Visit purefilter.nl or read the frequently asked questions.