Carbo Duo Softener
Carbo Duo is an innovative water filtration system that combines two-stage mechanical and carbon filtration with effective water softening. Thanks to advanced activated carbon filtration technology (‘Pleated activated carbon filtration’) and an ion exchange bed, Carbo Duo effectively removes mechanical impurities, chlorine, organic compounds and water hardness. It provides safe, clean and soft water for everyday use in households and small businesses.
Two-stage water
filtration technology
Clean and tasty water
thanks to the carbon filter
Quick and easy
cartridge replacement
Extended performance
of the carbon cartridge
Prevents limescale
and sediment build-up
Smart filtration duo
Combining softening resin with a carbon cartridge in a single water softener delivers a tangible improvement in water quality from the point of entry right through to the tap. This solution protects both your plumbing system and ensures comfort in everyday use.
The resin effectively softens the water
- improves water clarity
- protects the plumbing system and household appliances
- prevents limescale build-up
The carbon cartridge improves water quality
- removes chlorine and its derivatives
- eliminates organic compounds
- improves the taste and smell of the water
Carbon filter – cleaner water every day
The carbon filter improves water quality by removing chlorine, unpleasant odours and substances that affect its taste. This makes the water more pleasant for everyday use, whilst also providing better protection for your plumbing system and household appliances. Soft, additionally filtered water also means lower detergent consumption and better care for your skin and hair. The cartridge is essential for the water softener to work properly and needs to be replaced periodically (approx. every 1 year).
With the Carbo Duo, simply unscrew the cover using a key, remove the used cartridge and insert a new one.
- No complicated installation or servicing required
- Ready in a matter of moments
Automatic control unit – complete control and convenience
Enjoy soft water without the need for unnecessary adjustments or monitoring.
The state-of-the-art control unit automatically adjusts the water softener’s operation to match your home’s actual water consumption. Simply set the water hardness and regeneration time once, and the system will ensure the unit operates at its best.
Thanks to upflow regeneration, the water softener works even more effectively, uses less salt and water, and the resin bed lasts longer — which means lower running costs and greater reliability for years to come.

| Symbol | WS-21-LCD-CARBO-DUO |
| Maximum flow rate | 2 m3/h |
| Nominal flow rate | 1,5 m3/h |
| Fibrous activated carbon cartridge | 30" |
| Service life of the carbon filter | about 1 year |
| Average water consumption for regeneration | 180 l |
| Average salt consumption for regeneration | 2,5 kg |
| Dimensions (W/D/H) | 270 x 475 x 838 (mm) |
| Cylinder size (diameter/height) | 9x26" |
| Weight | 39 kg |
| Operating pressure | 2-4,4 bar |
| Operating temperature | 5-38°C |
| Ion exchange capacity | 59 dH x m3/h |
| Ionite content | 21 l |
| Connections | 1" |