Duo Active Plus
- Easy to install
- 10-year warranty on the stainless steel housing
- Clean water instantly
Pairs perfectly with this
Duo Active Plus
Pollutant, germ and limescale filter for the tap
The Duo Active Plus two-way tap filter delivers top-quality drinking water only when you actually need it. This saves cartridge capacity – and is kinder to the environment and your wallet. The Active Plus drinking water cartridge ensures a fresh taste and reduces a wide range of unwanted substances in tap water. Thanks to its fine pore size of just 0.7 µm, it manages to filter many harmful germs and bacteria out of the water. The integrated water softening means less visible limescale on surfaces such as taps or kettles. (Limescale reduction approx. 4–6 °dH)
The Duo is available in stainless steel, matt or black and turns any kitchen tap into a real eye-catcher. The filter housing fits all common taps with an M22 thread. With the included M24 adapter, the Alb Filter Duo is ready to use straight away in many cases. If a different adapter is needed, we'll be happy to include it. Ideally, determine the thread size of your tap before ordering – you'll find instructions in our thread guide.
The Duo filter housing
Made of high-quality V4A stainless steel
The robust and durable stainless steel housing is free of harmful substances, corrosion-resistant, easy to clean, germ-resistant and neutral in odour and taste.
Easy activation of the filter stage
With the stainless steel diverter lever, you can quickly switch between filtered and unfiltered water.
Compatible with all standard taps
Thanks to a wide range of adapters, the Duo can be installed on almost all standard taps. Our thread guide helps you find the right adapter.
One housing, three cartridges
Choose between our drinking water cartridges Active, Active+ and Nano.
10-year warranty on the stainless steel housing
Our Duo stainless steel housings come with a 10-year manufacturer's warranty.
Made in southern Germany
The Duo filter housing is manufactured in southern Germany and meets Alb Filter's high standards.
Filtered or unfiltered?
With the stainless steel diverter lever, you decide with a simple flick: filtered water for drinking and cooking –
unfiltered water at full mains pressure for washing up.
This saves filter capacity and significantly extends the life of the cartridge.
Will it fit my tap?
The Duo fits all standard taps with an M22 female or M24 male thread – for other sizes, suitable adapters are available (selectable free of charge when ordering).
Not suitable for:
- pull-out taps without a locking mechanism
- taps with sensor technology
- permanently installed or oval/square aerators
- unpressurised water heaters installed upstream
In these cases, one of our under-sink water filters is a better choice.
What is filtered?
Active Plus+ cartridge with Bioton filter material: the activated carbon stage binds odors, chlorine and dissolved pollutants, the ion exchanger reduces limescale by approx. 4–6 °dH – and the fine pores also mechanically retain particles and bacteria.
Chlorine and other off-flavours
The Bioton cartridge adsorbs unpleasant odours (chlorine, chlorinated hydrocarbons, CFCs and much more) and off-flavours in drinking water.
Limescale – noticeably softer water
The ion exchanger reduces carbonate hardness by approx. 4–6 °dH – fewer limescale stains on glasses and in the kettle.
Microplastics and other fine particles
The pores of the Bioton cartridge are around 100 times finer than a hair (0.7 µm) – microscopically small plastic particles and other particles are reliably trapped.
Germs and bacteria
The 0.7 µm germ barrier retains germs and bacteria purely mechanically – without chemicals.
Pharmaceutical residues and pesticides
Organic compounds such as pesticides, herbicides, insecticides and pharmaceutical residues, as well as hormones and hormone-like substances, are reduced.
Heavy metals such as lead and copper
The adsorptive effect of the activated carbon binds and reduces heavy metals in drinking water.
Binds odours and pollutants
Thanks to the strong surface forces (adhesion) of BIOTON, unwanted turbidity and odours such as chlorine, but also organic compounds and pollutants, are filtered out of the water. These include pharmaceutical residues, hormones, pesticides/plant protection products, per- and polyfluoroalkyl substances (PFAS) and many more.
Retains microplastics and bacteria
Bioton has pores of only 0.7 µm – around 100 times finer than a human hair. Sand, rust and microplastics are trapped in them, and bacteria are also mechanically retained. Certified germ protection is provided by the Nano cartridge.
Limescale reduction through ion exchange (softening effect)
In water treatment, softening (limescale reduction) of the water is achieved through the chemical process of “ion exchange”. With the help of cation and anion exchangers, unwanted salts are removed from the water. For example, one calcium molecule is replaced by two sodium molecules.
When the water exits the fine channels, the pressure drops abruptly. In the process, part of the limescale (Ca²⁺) is converted into aragonite. Aragonite has a different structure from limescale and adheres much less to surfaces – which reduces annoying limescale stains.
What's included
- 1× Alb Duo stainless steel housing
- 1× Active Plus+ filter cartridge
- 1× thread adapter M22 male to M24 male (alternative available free of charge)
Technical data
Duo housing
- Dimensions (H × W)
- 109 × 120 mm
- Weight
- 450 g
- Colours
- Natural stainless steel, matt, black
- Material
- V4A stainless steel
- Connection
- M22 × 1 female thread
Check the dimensional drawing: make sure there is enough space under the tap.
Downloads
Active Plus+ cartridge
- Dimensions (H × W)
- 93 × 48 mm
- Weight
- 95 g
- Filter material
- Bioton
- Filter technology
- mechanical, adsorptive, catalytic + ion exchange
- Filter type
- Pollutant filter with germ barrier down to 0.7 µm
- Germ barrier
- 0.7 µm
- Replacement interval
- 4 months
- Capacity
- 3,000–5,000 l*
- Flow rate
- approx. 6 l/min**
- Water temperature
- up to approx. 45 °C
Flow rate
Flow rate at approx. 3 bar water pressure
* Capacity depends on the quality of the incoming water. ** Flow rate at approx. 3 bar water pressure; filter performance depends on the flow speed.
Frequently asked questions
What thread does my tap have?
Most kitchen taps have an M22 female or M24 male thread. Unscrew the aerator and measure – our thread guide takes you to the right adapter in 4 steps.
What if the adapter doesn't fit?
We'll exchange adapters free of charge until one fits. Just write to us with a photo of your tap.
How much does the Duo reduce limescale?
The Active Plus+ cartridge reduces carbonate hardness by approx. 4–6 °dH through ion exchange – limescale stains on glasses and in the kettle visibly decrease.
Does the filter reduce the water pressure?
Filtered water flows at approx. 6 l/min (at 3 bar) – enough for drawing water and cooking. For washing up, you switch to unfiltered using the lever and get the full mains pressure.
Does the Duo fit pull-out taps?
Only if the spray head can be locked in place. The Duo cannot be fitted to freely movable hose spray heads or sensor taps.
Customer reviews
Genuine buyer reviews – invited after purchase, independently collected and published by REVIEWS.io.
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Marianne Verified buyer
I am very satisfied, easy to install and the water tastes very good
Translated from GermanTranslated from German · Show originalHide original
Ich bin sehr zufrieden, leicht zu installieren und das Wasser schmeckt sehr gut
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Anonym Verified buyer
Super high-quality workmanship, easy installation and fast delivery. The water definitely tastes better
Translated from GermanTranslated from German · Show originalHide original
Super hochwetige Verarbeitung, einfache Montage und schnelle Lieferung. Das Wasser schmeckt definitiv besser
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Angelika Verified buyer
Fast delivery and easy installation. The water feels softer and tastes good. I am very happy with my choice.
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Schnelle Lieferung und einfache Montage . Das Wasser ist gefühlt weicher und schmeckt gut. Bin mit meiner Wahl sehr zufrieden.
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Christine Verified buyer
In my opinion the water tastes noticeably better/softer. Plus, in black it looks great in the kitchen.
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Das Wasser schmeckt meiner Meinung nach deutlich besser/weicher. Zudem passt er in schwarz klasse in die Küche.
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Wolfgang Verified buyer
I'm very satisfied. The water tastes really good 👍👍
Translated from GermanTranslated from German · Show originalHide original
Ich bin sehr zufrieden Das Wasser schmeckt richtig gut 👍👍
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Anonym Verified buyer
We are very satisfied with the advice and the build of the filter. The water quality has also become noticeably better.
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Wir sind sehr zufrieden mit der Beratung und der Ausführung des Filters. Auch die Wasserqualität ist spürbar besser geworden.
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Vielen Dank für die Rückmeldung.
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Heide-Rose Verified buyer
Easy installation, great result
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Einfache Montage, tolles Ergebnis
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Vielen Dank!
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Kunde Verified buyer
Not only does this filter look very good, but the filtered water contains far less limescale. That protects my appliances and the coffee tastes better and more intense. Since I live in an old building and don't know how old the pipes are or what material they're made of, the filter gives me a good feeling of having filtered out the pollutants.
Translated from GermanTranslated from German · Show originalHide original
Dieser Filter sieht nicht nur optisch sehr gut aus, sondern das gefilterte Wasser enthält viel weniger Kalk. Das schont meine Geräte und der Kaffee schmeckt besser und intensiver. Da ich in einer Altbauwohnung wohne und ich nicht weiß, wie alt und aus welchem Material die Rohre bestehen, gibt der Filter mir ein gutes Gefühl, die Schadstoffe rausgefiltert zu haben.
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Vielen Dank. Freut uns sehr, dass Sie mit unserem Produkt zufrieden sind.
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Frank Verified buyer
Works flawlessly
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Funktioniert tadellos
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Gabriele Verified buyer
Installation was easy, the thing is heavier than expected - but works very well
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Einbau war easy, Teil ist schwerer als gedacht - funktioniert aber sehr gut
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Sandra Verified buyer
It's amazing how good water can taste. It feels "softer", "lighter" compared to without a filter. For the next caravan season our Hobby will get its own water filter. I can only recommend it.
Translated from GermanTranslated from German · Show originalHide original
Es ist erstaunlich wie gut Wasser schmecken kann. Es fühlt sich „weicher“ , „leichter“ an im Vergleich ohne Filter. Für die nächste Wohnwagen Saison bekommt unser Hobby seinen eigenen Wasserfilter. Ich kann ihn nur empfehlen.
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Vielen Dank für die positive Rückmeldung,
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Anonym Verified buyer
Easy installation, good quality, I'm very satisfied. Clear recommendation!
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Einfache Montage, gute Qualität, bin sehr zufrieden. Klare Empfehlung!
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Vielen Dank für die tolle Bewertung.
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Thorsten Verified buyer
Unfortunately, even when filtering, a trickle always ran out of the other water outlet. As the thread of the separate connecting piece was very sharp, I cut my hand while screwing it on. A warning notice would make sense here!
Translated from GermanTranslated from German · Show originalHide original
Leider lief auch bei Filterung immer ein Rinnsal aus dem anderen Wasserauslass. Da das Gewinde des separaten Verbindungsstücks sehr scharf war, habe ich mir beim Aufschrauben in die Hand geschnitten. Hier wäre ein Warnhinweis sinnvoll!
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Lieber Thorsten, vielen Dank für die Rückmeldung. Gerne dürfen Sie sich an unseren Kunden-Support richten dann finden wir sicherlich eine Lösung für Sie.
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Christiane Verified buyer
Great product. Quality matches the price. But the thread on the adapter is so sharp-edged that you injure yourself if you install it without gloves. The edges should be deburred, then it would be a five-star product.
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Tolles Produkt. Qualität passt zum Preis. Das Gewinde vom Adapter ist aber so scharfkantig, dass man sich bei einer Montage ohne Handschuhe verletzt. Kanten sollten noch gebrochen werden, dann wäre es ein fünf Sterne Produkt.
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Michael Verified buyer
Very good, the only fly in the ointment is that even in the position without filter the flow rate is heavily reduced, that's actually unnecessary
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Sehr gut, der einzige Wermutstropfen auch in der Stellung ohne Filter wird die Durchflußmenge stark reduziert ist eigentlich unnötig
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Vielen Dank für die Rückmeldung. Gerne dürfen Sie sich an unseren Kunden-Support wenden und wir finden eine Lösung für Sie.
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Anonym Verified buyer
Absolutely easy installation and a clear improvement in the taste of the tap water.
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Absolut einfache Montage und deutliche Verbesserung beim Geschmack des Leitungswassers.
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Oliver Verified buyer
The tap water now tastes excellent. I no longer buy mineral water. The descaling effect is measurable and noticeable. For the portafilter coffee machine, with our hard water, I personally would like stronger descaling, but that's probably hardly possible technically.
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Das Leitungswasser schmeckt jetzt hervorragend. Ich kaufe kein Mineralwasser mehr. Die Entkalkungswirkung ist meßbar und spürbar. Für die Siebträger-Kaffeemaschine wäre bei unserem harten Wasser eine stärkere Entkalkung für mich persönlich wünschenswert, wird aber technisch kaum möglich sein.
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Anonym Verified buyer
We deliberately chose the Alb Filter Duo Active+ water filter because it also filters out pollutants. We are very happy with our purchase decision.
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Wir haben uns ganz bewusst für den Alb Filter Duo Active+ Wasserfilter entschieden, weil dieser auch Schadstoffe filtert. Wir sind sehr zufrieden mit unserer Kaufentscheidung.
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Michaela Verified buyer
Very good filter purification, I'm very satisfied.
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Sehr gute Filterreinigung bin sehr zufrieden.
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Anonym Verified buyer
Very satisfied so far. Installation was very easy and the look is appealing too. The water tastes very good. You notice the difference.
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Bin bisher sehr zufrieden. Die Montage war sehr einfach und die Optik ist auch ansprechend. Das Wasser schmeckt sehr gut. Man merkt den Unterschied.
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