Tap filter · Made in Germany
Clean drinking water in 2 minutes. No installation, no plumber.
The Alb Duo Active Plus simply screws onto your tap – it filters bacteria, lead, chlorine & microplastics and even reduces limescale. From 1.2 centimes per litre.
In stock: with you in 1–2 working days · 14-day right of return · No subscription
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Filters down to 0.7 µm: bacteria & germs, lead & copper, microplastics, chlorine, pesticides & hormones – and reduces limescale by approx. 4–6 °dH.
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Fitted in 2 minutes – fits standard M22/M24 threads, no tools, ideal for rented flats.
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Stainless steel diverter lever: filtered for drinking, unfiltered for washing up – so the cartridge lasts longer.
Made in
southern Germany
14-day
right of return
A-Post shipping
free from CHF 80
Easy payment
with TWINT or card
The problem
Your water is strictly monitored. But not for everything – and not all the way to your tap.
The last few metres are down to you
The waterworks only guarantees the quality up to the house connection. Nobody is responsible for old lead and copper pipes in the building – except you.
Invisible in the glass
Microplastics, hormones and pharmaceutical residues: substances for which there are in some cases no limit values at all in drinking water – and you can't taste them.
Boiling doesn't help
Heavy metals and many trace substances do not disappear when water is boiled. On the contrary: as water evaporates, the concentration rises.
Sources: Umweltbundesamt (German Environment Agency), Trinkwasserverordnung (German Drinking Water Ordinance)
The solution
One simple step, and your tap filters by itself.
The Duo Active Plus sits directly on the tap – BIOTON activated carbon filters down to 0.7 µm. With the diverter lever, you can switch between filtered and unfiltered at any time.
- 6 l/min flow rate at 3 bar
- 3,000–5,000 l per cartridge – change every 4 months
- Compact: just 109 × 120 mm, 450 g – fitted without tools, resistant up to approx. 45 °C
What the filter retains
Bacteria and germs
The fine 0.7 µm filtration of the BIOTON activated carbon reliably retains bacteria and germs.
Heavy metals such as lead and copper
The adsorbent effect of the activated carbon binds and reduces heavy metals from old pipes.
Microplastics and fine particles
The tiniest plastic fragments and particles down to 0.7 µm are reliably retained.
Chlorine and off-flavours
Odours and taste impairments such as chlorine are adsorbed – for fresh, neutral-tasting water.
Pesticides, pharmaceuticals, hormones
Organic compounds such as pesticides, pharmaceutical residues and hormone-like substances are reduced.
Do the maths
Much cheaper than bottled water
Bottled water
~CHF 1’100 per year*
- ~180 crates to lug & store
- Deposits, plastic, trips to the shop
- Microplastics in bottles too, depending on the source
Alb Duo Active Plus
~CHF 108 per year from year 2**
- From 1.2 centimes per litre, right at the tap
- Diverter lever saves cartridge capacity
- No installation – fitted in 2 minutes
*Family, approx. 6 l/day, mineral water avg. CHF 0.50/l. **3 cartridges at CHF 35.90/year; one-off purchase from CHF 169.90. Year 1 total: from approx. CHF 242.
The offer
The Worry-Free Set: 12 months of fresh water. One simple step.
Duo Active Plus, natural stainless steel, incl. first cartridge
Set of 2 Active Plus cartridges = a full 12 months of filter performance
Cartridge change reminder, so you never miss one again
You save CHF 34.95 – around 15% on the whole set: the second cartridge is free. The discount is deducted in the cart.
14-day right of return · 10-year warranty
Just the filter? Individually from CHF 169.90
14-day right of return
Not quite right? You can return everything in its original packaging and unopened to Schnarwiler AG in Weggis within 14 days of receipt. We will refund the purchase price or credit it to your next order.
Plus: 10-year manufacturer's warranty on the stainless steel housing.
What customers say
Echte Käuferbewertungen – nach dem Kauf eingeladen, unabhängig gesammelt und veröffentlicht von REVIEWS.io.
“Why not just …?”
[Have comparison values legally checked before going live – UWG]
Any questions?
Frequently asked questions
Will the Duo fit my tap?
On all standard taps with an M22 female thread – an M24 adapter is included, and other adapter models can be selected free of charge if required. Not suitable for pull-out spray heads, sensor taps, permanently installed or oval/square aerators, or unpressurised water heaters.
I rent my home – can I use the filter?
Yes. The Duo is screwed onto the tap thread without tools and can be removed at any time without leaving a trace – the perfect solution for rented flats.
What is the diverter lever for?
With the stainless steel lever, you switch between filtered water (for drinking and cooking) and unfiltered water (for washing up). This way, you only use the cartridge capacity when it counts.
How often do I need to change the cartridge?
Every 4 months or after 3,000–5,000 litres. An Active Plus cartridge costs CHF 35.90 – that's from 1.2 centimes per litre.
Does the filter help with limescale?
Yes, noticeably: the Active Plus cartridge reduces water hardness by approx. 4–6 °dH – tea and coffee taste finer, and appliances scale up more slowly.
Duo or under-sink – which suits me?
The Duo is the flexible solution without installation, visible on the tap. If you want an invisible, permanently installed solution under the sink, our under-sink systems are the right choice.
One simple step. Every glass.
Your tap can do more than you think – from today, it filters by itself.
14-day right of return · Shipped by post