How it works
How Aquain softeners work (pictured: Aquain V3). All models V1–V4 work on the same principle.
Tap water enters the bottle through the inlet (IN).
The resin beads exchange limescale (calcium and magnesium) for sodium.
Softened water flows through the riser tube to the outlet (OUT).
Local water hardness
Enter your postcode. We show you your municipality's official guide value and which Aquain model suits it.
Dots = municipalities with data. Cantons are only coloured (median) if values are available for at least 30 % of municipalities.
Guide value, please check with your municipality. We do not yet have an official value for your municipality. Measure it yourself with the test strips or check trinkwasser.ch.
Our recommendation
Aquain V4: for high consumption / catering – large and heavy, permanently installed, not mobile. Ask us for advice.
Advice via WhatsApp
Measure water hardness yourself
Aquain water hardness test strips for °dH & °fH: result in a few seconds, in °fH and °dH.
In the cart. Go to cart
Guide values without guarantee, hardness can vary depending on the supply zone. Data: swisstopo (directory of localities, swissBOUNDARIES3D), Canton ZH (Cantonal Laboratory, OGD), SIG. Source : Portail des données SITG (État de Genève), extrait en date du 18.10.2026. Cantonal laboratories TG and TI, Health Office SO, Groupe E (FR/VD/NE), municipalities and water suppliers. Source and date are shown with each result.
V1–V4 compared
Water hardness, consumption and space determine the right size. Compare the models and calculate your approximate litre capacity.
Tragen Sie Ihre Wasserhärte ein. Mit dem täglichen Verbrauch erhalten Sie zusätzlich eine grobe Orientierung für das Regenerationsintervall.
| Modell | Höhe × Durchmesser | Geschätzte Liter | Ungefähres Intervall |
|---|---|---|---|
| Aquain V1 | 400 × 190 mm | 1’680 l | — |
| Aquain V2 | 500 × 190 mm | 2’520 l | — |
| Aquain V3 | 600 × 190 mm | 3’360 l | — |
| Aquain V4 | 900 × 190 mm | 4’200 l | — |
Our recommendation
Rechnerische Richtwerte bei vollständiger Enthärtung, ohne Verschnitt. Grundlage: 1680 / 2520 / 3360 / 4200 Liter bei 20 °fH (ca. 11 °dH). Die Resthärte regelmässig messen; der Durchflussmonitor zählt Liter und misst keine Wasserhärte.
Applications
Besides catering and cleaning, customers also use Aquain V1–V4 on the road and at home.
Limescale-free water for filling the caravan or motorhome tank – directly at the water connection, for example at the campsite. Softening needs no electricity, and the system is regenerated with salt.
Limescale-free shower water – fewer limescale stains on glass and fittings. Aquain is connected between the mixer and the shower hose. For the right connection, simply send us a photo of your fitting.
With softened water, less limescale builds up in your ice machine – on the evaporator, valves and lines. The result: clearer ice cubes, fewer breakdowns and less frequent descaling. Aquain is installed directly in the ice machine's water supply line.
