Duo Active
- Easy to install
- 10-year warranty on the stainless steel housing
- Clean water instantly
Pairs perfectly with this
Duo Active
Pollutant filter for the tap
The Duo Active 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 drinking water cartridge ensures a fresh taste and reduces a wide range of unwanted substances in tap water.
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.
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.
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.
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 cartridge made of sintered coconut activated carbon block. The Active cartridge works in two ways: adsorption binds odours, chlorine and dissolved pollutants, while mechanical filtration retains particles down to 10 µm – at a full flow rate of approx. 7 l/min.
Chlorine and other off-flavours
The high-quality Alb Filter coconut activated carbon block adsorbs unpleasant odours (chlorine, CHCs, CFCs and much more) and off-flavours in drinking water.
Microplastics and other fine particles
Thanks to the ultra-fine structure of the sintered activated carbon, microscopic plastic particles are reliably retained.
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
The strong surface forces (adhesion) of the activated carbon remove unwanted cloudiness and odours such as chlorine from the water, as well as organic compounds and pollutants. These include pharmaceutical residues, hormones, pesticides/plant protection products, per- and polyfluoroalkyl substances (PFAS) and many more.
Retains microplastics
The sintered activated carbon has pores of only 10 µm – about 7 times finer than a human hair. Microplastics, sand, rust and other particles reliably get caught in them.
What's included
- 1× Alb Duo stainless steel housing
- 1× Active 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 cartridge
- Dimensions (H × W)
- 93 × 48 mm
- Weight
- 89 g
- Filter material
- Sintered coconut activated carbon block
- Filtration technology
- Mechanical, adsorptive, catalytic
- Filter type
- Pollutant filter
- Pore size
- 10 µm (0.01 mm)
- Replacement interval
- 4 months
- Capacity
- 3,000–5,000 l*
- Flow rate
- approx. 7 l/min**
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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Anonym Verified buyer
Fast shipping, easy installation. The water tastes clearer. I got advice beforehand from the thread guide. Everything went great!
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Schneller Versand, einfache Installation. Das Wasser schmeckt klarer. Habe mich vorher beim Gewinderatgeber beraten lassen. Alles prima gelaufen!
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Bernhard Verified buyer
I like the system very much. I would find it even better if the loss of height (under the tap) were smaller. It does get more difficult to get something tall like a bottle or vase under the tap. For me, the operation would be more logical if you turned the lever towards the cartridge to get water from there, rather than away from it.
Translated from GermanTranslated from German · Show originalHide original
System gefällt sehr gut. Noch besser fände ich es, wenn der Verlust an Höhe (unter dem Hahn) geringer ausfallen würde. Es wird schon schwieriger etwas hohes wie eine Flasche oder Vase unter den Hahn zu bekommen. Für mich wäre die Bedienung logischer, wenn man den Hebel zur Kartusche hin drehen würde, um von dort Wasser zu bekommen, als von ihr weg.
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Brigitte Verified buyer
Works great and was very easy to fit. I'd happily buy from Alb Filter again
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Funktioniert super und war sehr einfach, ihn anzubringen. Gerne kaufe ich wieder bei Alb Filter
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Vielen Dank!
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Marcel Verified buyer
Very good quality and great service!
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Sehr gute Qualität uns super Service !
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Rinkens Verified buyer
Looks good and works excellently
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Sieht gut aus und funktioniert hervorragend
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Peter Verified buyer
Very good quality. Quick to install. Only swapped the aerator for the tap flow, as the water volume was too low for me. Otherwise TOP!
Translated from GermanTranslated from German · Show originalHide original
Sehr gute Qualität. Lässt sich schnell installieren. Habe nur den Perlator getauscht vom Hahndurchfluss, da mir die Wassermenge zu gering war. Ansonsten TOP!
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Ute Verified buyer
Was easy to fit. The filtered water tastes much better. We are convinced by the filter.
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War einfach zu montieren. Das gefilterte Wasser schmeckt viel besser. Wir sind von dem Filter überzeugt.
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Nicole Verified buyer
Very good, am completely satisfied
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Sehr gut bin ganz zufrieden
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Afsoun Verified buyer
It is very easy to install and was delivered very quickly, friendly and reliable staff and service!
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Er ist sehr einfach zu installieren und ist sehr schnell geliefert freundliche und zuverlässige Mitarbeiter und Service!
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Dennis Verified buyer
Hello dear Alb Filter team, many thanks for the water filter and the fast delivery! Although it is specified that a tap filter should not actually be mounted on a flexible fixture, it worked for me. I have a hot water boiler under the sink …
Translated from GermanTranslated from German · Show originalHide original
Guten Tag liebes Alb Filter Team, vielen Dank für den Wasserfilter und die schnelle Lieferung! Es ist zwar vorgegeben, dass ein Wasserhahnfilter eigentlich nicht an einer flexiblen Vorrichtung montiert werden sollte, hat bei mir allerdings geklappt. Ich habe einen Warmwasserboiler unter der Spüle …
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Anonym Verified buyer
We've had the filter for the motorhome for 3 years now and are very happy with it there, which is why we've now bought it for home too. Delicious water for tea, coffee or on its own. Great
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Wir haben den Filter schon seit 3 Jahren fürs Wohnmobil und sind dort sehr zufrieden, aus diesem Grund haben wir ihn nun auch für zuhause gekauft. Leckeres Wasser für Tee, Kaffee oder pur. Toll
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Stefanie S Verified buyer
The Duo Active delivers what it promises, the water tastes significantly better! The switch-over function of the tap filter is very practical. We supposedly have water hardness 13 and, as stated, the Duo Active does not remove limescale. Because of the limescale deposits in the kettle, we will probably try the Active Plus when the filter change is due.
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Der Duo Active hält, was er verspricht, das Wasser schmeckt deutlich besser! Die Umstellfunktion des Wasserhahnfilters ist sehr praktisch. Wir haben angeblich Wasserhärte 13 und wie angegeben entkalkt der Duo Active nicht. Wegen den Kalk-Ablagerungen im Wasserkessel werden wir, wenn der Filterwechsel ansteht, wahrscheinlich mal den Active Plus ausprobieren.
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Frank Verified buyer
The filter, like the first one, is very good. In my opinion, though, there is room for improvement. Every time the tap is turned off, about 1-2 shot glasses of water run on afterwards. With a different internal routing you could surely get that under control. Best regards Frank Simanowski
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Der Filter ist wie auch schon der erste sehr gut. Meines Erachtens besteht aber nachbesserungs Bedarf. Jedes Mal wenn der Wasserhahn ausgemacht wird, läuft ca 1-2 Schnaps Gläser Wasser nach. Mit einem inliegendem anderem Verlauf könnte man das sicher in den Griff bekommen. Lg Frank Simanowski
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Anonym Verified buyer
Had first ordered a filter for the tap, this has the advantage that hot and cold water is filtered, unfortunately our tap has a spout that can rotate on its axis. When fitting the filter, the outlet of the water jet twisted. So I had to opt for the under-the-sink installation. But what's much more important, the filtered water now tastes excellent!!! Thank you dear Alb team for such a good result! Best regards DK
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Hatte zuerst einen Fikter für der Wasserhan bestellt, dieser hat den Vorteil das warm und Kaltwasser gefiltert wird, leider ist unsere Wasserhahn mit einem Auslass der sich in der Achse drehen kann. Im Anbau des Filters verdrehte sich der Auslass des Wasserstrahls. Dadurch musste ich mich für den Einbau Untertisch entscheiden. Aber das wesentlich wichtiger ist, das gefilterte Wasser schmeckt jetzt hervorragend!!! Danke liebes Alb Team für so ein gutes Ergebnis! Viele Grüße DK
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Anonym Verified buyer
Quality and workmanship very good, filter performance also very good.
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Qualität und Verarbeitung sehr gut, Filterleistung ebenfalls sehr gut.
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Sven Verified buyer
I spent quite a while looking into water filters in all sorts of variants and talked to friends and acquaintances who use the most varied methods of filtering water at home. From those conversations, no system/container with standing water was an option for me. Every second person complains about algae forming. During my search on the internet I came across Alb Filter and, going by my gut feeling, I thought it was a system suited to me. After installation I'm surprised by the result and it has exceeded my expectations. Here in Dresden there is often …
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Ich habe mich eine ganze Weile mit Wasserfilter in den unterschiedlichsten Varianten beschäftigt und mit Freunden, Bekannten, die unterschiedlichste Methoden zum Wasserfiltern zu Hause haben, gesprochen. Aus den Gesprächen kam für mich kein System/Gefäß mit stehendem Wasser in Frage. Jeder 2.klagt über Algenbildung. Bei meiner Suche im Internet bin ich auf Alb Filter gestoßen und von meinem Bauchgefühl her, hielt ich es für ein für mich geeignetes System. Nach der Installation bin ich von dem Ergebnis überrascht und es hat meine Erwartungen um übertroffen. Hier in Dresden ist oft …
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Anonym Verified buyer
Very nice product and "child's play" to fit with the right adapter. Unfortunately OUR adapter wasn't listed in the list and after an intensive search online I did find it at Albfilter after all: for recessed aerators there is a 22 female to 22 male adapter. A quick email and the goods were already on their way - TOP!
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Sehr schönes Produkt und mit dem richtigen Adapter "kinderleicht" zu montieren. Leider war UNSER Adapter nicht in der Liste aufgeführt und nach intensiver Suche im Netz habe ich ihn dann doch noch bei Albfilter gefunden: für tiefsitzende Perlatoren gibt es einen 22 IG auf 22 AG - Adapter. Kurze Mail und schon war die Ware unterwegs - TOP !
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Karin Verified buyer
I'm totally thrilled and hadn't imagined the difference compared to ordinary water. My morning coffee and my fruit juice mixed drinks now taste much, much better. Should have done it sooner.
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Ich bin total begeistert und hatte mir den Unterschied zum herkömmlichen Wasser nicht vorgestellt. Mein morgendlicher Kaffee und meine Fruchtsaft Mixgetränke schmecken jetzt viel, viel besser. Hätte ich schon eher machen sollen.
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Anonym Verified buyer
Very good. Thank you.
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Sehr gut. Danke.
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Bea Verified buyer
Nice design, can be swivelled when connected, which I find very advantageous
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Schönes desine lässt sich angeschlossen schwenken was ich sehr vorteilhaft finde
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