Your latest-generation anti-scale treatment

with edible CO2, salt-free
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Hydrokube is the latest generation of effective, salt-free anti-scale treatment.

The CO2 water softener combines many advantages. Based on proven technology in the food industry, it will bring you savings and efficiency.

co2 softener


– Hydrokube’s C02 water softener has been tested and certified 100% effective by the Belgian laboratory Ecochim and Test-Achat.

CO2 anti-limescale treats and redistributes 100% of used water

– Exclusive function to remove limescale from pipes


– You save €2,000 with salt-free softened water. It’s enough to make the price of a CO2 water softener worthwhile.

– Longer service life for machines, hot water tanks, taps and toilets

– By eliminating limescale, you use less electricity to heat your water, less soap to clean, and save money on anti-scale products.


– Thanks to this salt-free water softener, softened water is safe to drink and retains its true taste and natural trace elements (calcium, magnesium, potassium, iron, sodium, phosphorus).

– No pollutant discharge

– Hydrokube uses 100% recycled food-grade C02


With a CO2 anti-scale save money compared to a salt softener

With the Hydrokube, you’ll save on average:

  • 13 m³/year of water consumption, the cost of resin regeneration (average price €5.4/m³ = €70 incl. VAT1),
  • 130/year for maintenance and resin disinfection,

Total savings: over €2,000 (€200/year over 10 years)

Then there’s the cost of the environmental impact of discharging salt into the water.


1 source 2022 “votre facture à la loupe – calculez votre facture” (your bill under the magnifying glass – calculate your bill)

softener co2 price

Hydrokube kits – CO2 water softeners

The Hydrokube CO2 water softener involvesadding edible CO2 to the water to soften it, and consists of 2 components: the Hydrokube box and the CO2 pack.

1- Hydrokube box It manages the entire system. Its role is to ensure the addition of the precise amount of CO2 in the system, helping to secure it.
hydrokube co2 water softener
hydrokube co2 water softener
hydrokube comfort co2 water softener
² The exclusive Boost Clean function temporarily increases the level of CO2, which has a curative effect on encrusted limescale . Thanks to the Boost Clean function, deposits accumulated before the Hydrokube was installed, for example, will gradually dissolve. This function is also useful in the event of a late changeover of the empty CO2 cylinder, where no treatment will be carried out for several days.

2- The CO2 pack CO2 in every Hydrokube CO2 softener kit

CO2 Kit
It regulates the CO2 pressure supplied to the device.

  • CO2 bottle (10 kg C02 – size 125x14cm)
  • Adjustable CO2 regulator with 2 pressure gauges
  • CO2 hoses – 2 metres – food quality
  • Bottle mounting kit: chain, 2 hooks, 2 deformation dowels

The electronic setting pen

water softener pen co2
This easy-to-use device is very practical for checking your water’s treatment value from time to time and, if desired, easily adjusting your treatment settings.

This device is included in the kit for Comfort and Plus models. It comes with a leatherette pouch with a clip for belt attachment and a calibration buffer solution that eliminates measurement drift.

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What our customers say

Google reviews

Hydrokube is the economical, reliable scale remover for your home and your health. As effective as a salt water softener, but much more economical thanks to food-grade CO2 treatment.
Nicolas Maskens


Efficient, environmentally and health-friendly, inexpensive…
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Lorsque j’ai acheté ma maison en 2002, elle était équipée d’un adoucisseur au sel – je me suis vite rendu compte que celui-ci rejetait des centaines de litres d’eau à l’égout chaque semaine ! Je l’ai donc débranché.
Evidemment, j’ai commencé à avoir des problèmes liés au calcaire… entre autres, tuyauterie interne de ma chaudière complètement bouchée !
Par chance j’ai pu bénéficier en 2015 de la technologie au CO2 qui est aussi efficace mais ne génère pas ces rejets intempestifs à l’égout. De plus, le calcium reste présent (sous une autre forme chimique) dans l’eau du robinet que nous buvons –> bon pour le corps :). Et puis le CO2 pour une année me coûte à peine l’équivalent de deux recharges “SodaStream”…
Et il y a encore des petits avantages – j’ai par exemple identifié une fuite d’eau importante grâce à l’écran du module Hydrokube qui affiche la consommation quotidienne … 150 litres déjà “consommés” alors que je me lève et que personne n’a encore pris de douche… pas normal ! Avec le compteur ‘officiel’ de hydrobru j’aurais constaté la fuite en recevant ma facture annuelle…
Bref… que des avantages…
Sébastien Van Nechel


This review after almost 2 years of use.
Hydrokube Confort installation placed by our heating engineer in May 2019. …
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We are a family of 5. To date, I’m very satisfied. In our case, there are many positive examples between before and after. Before the installation, the faucet aerators quickly filled up with limescale flakes, forcing me to descale them regularly. Since installation, no more limescale flakes in the mousseurs. The same applies to stainless steel surfaces in the kitchen and bathroom, with much less residue. Ditto in the electric kettle, etc. The difference between before and after was very clear in our case. I’d like to emphasize the importance of correct setting during initial startup.
What’s more, we drink this water every day. The big advantage is that, unlike systems with salt tablets, the water retains a good taste.
Once the system is installed and properly set up, you forget about it, and that’s all there is to it. Just check the CO2 cylinder pressure after 6 months to 1 year. The instructions supplied are clear.
Best regards,
Albert Dewever


Very happy with my new water softener. It runs on CO2, and having had a salt water softener in the past, I’m happy to …
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can assure you that it’s much more efficient. The water no longer tastes salty…
Thanks to the installer who was very professional!

Any questions?

Here you’ll find answers to the most frequently asked questions.

How can CO2 help fight limescale?

CO2 gas (carbon dioxide) exists naturally: for example, it is naturally present in sparkling water. The Hydrokube water softener injects it into your water circuit and pipes, dissolving limescale and transforming it into calcium bicarbonate, perfectly soluble in water. Calcium bicarbonate is used in food as an acidity regulator and stabilizer, and in medicine to regulate heart pressure.

Is it effective against limescale deposits on sanitaryware?

Thanks to this C02water softener, your faucet’s aerator won’t get clogged, and your toilet valve, hot water tank, etc. won’t scale up. You’ll still have residues other than limescale, such as soap deposits and calcium bicarbonate (a fine white powder that can be removed with a damp cloth/sponge). Of course, there will always be a standard cleaning of the sanitary facilities.

Installing the Hydrokube CO2 water softener

We have a network of dealers all over Belgium to take care ofinstallation. What’s more, the Hydrokube CO2 water softener can easily be installed by a a good handyman.
If your home is more than 10 years old, we recommend that you go through a Hydrokube-approved professional: the 6% VAT avoids a large part of the cost of standard installation (from €186 to €239).

Do I need to have a particular pipe configuration in the house?

There’s no need for a bypass or sewer. A nearby power outlet (approx. 1 m) is required, and we recommend installing a water pressure regulator. Installation requires no special configuration, and we’ve never encountered any configuration problems.

Are there any costs other than changing the CO2 cylinder?

With our CO2 softener, there are no maintenance costs and no wasted water because there’s no sewer connection. Consumption is negligible, well below 0.1 kWh per 100 m3 of water consumed, or less than 1 EUR.

What is the CO2 consumption?

You need to change the 10kg bottle of CO2 every 100 m3 of water (depending on the hardness of your water):

  • The dial on the cylinder regulator indicates the minimum pressure threshold.
  • The Hydrokube Comfort’s digital display shows the number of CO2 units used and the total volume of water consumed.

Does it work for my whole house?

In some appliances, when the water is heated very high and left in the open air for a certain length of time, some of the CO2 evaporates and the limescale forms a thin film: this happens in electric kettles. In some long-cycle household dishwashers, a 3-in-1 tablet is all you need to avoid it.

Does this work if I have low water pressure?

Treatment requires at least 2 bars of dynamic water pressure at the entrance to the home after the water meter. The water distributor guarantees a static pressure of between 2 and 10 bar at the meter (excluding gaps and isolated cases). The probability of not having enough water pressure for treatment is therefore practically zero.