Water Treatment: Softening & Water Filters for Dishwasher and Coffee Machine
Water treatment is often underestimated in the catering industry – yet water quality determines the lifespan of your equipment and the quality in the glass and cup. Scale encrusts heating elements, leaves streaks on glasses and distorts the coffee flavour. This guide explains why filters and softening quickly pay off – especially for dishwashers and coffee machines.
Why hard water is a problem
The harder the water (lime content), the stronger the effects. The decisive factor is the water hardness in °dH – ask your water supplier or measure with a test strip.
| Water hardness | Range (°dH) | Recommendation |
|---|---|---|
| soft | up to 8.4 | Filter usually sufficient |
| medium | 8.4 – 14 | Filter/Softening recommended |
| hard | over 14 | Softening/Reverse osmosis urgently advised |
Consequences of untreated hard water: scale deposits on heating rods (higher energy consumption, costly repairs), limescale spots & streaks on glasses and cutlery as well as a
The three water treatment methods
- Filter (activated carbon + scale protection): reduces chlorine, turbidity and protects against scale – the standard solution for coffee machines and combi steamers
- Softening (ion exchanger): exchanges calcium/magnesium for sodium – effective against scaling in dishwashers and hot water devices
- Reverse osmosis: almost fully demineralised water – highest level for barista quality and sensitive technology
Dishwasher or coffee machine – what needs what?
| Device | Goal | Solution |
|---|---|---|
| Commercial dishwasher | clear glasses, no scale in boiler | Softening + rinse aid |
| Coffee/Espresso machine | flavour & brew group protection | Filter, if applicable reverse osmosis |
| Combi steamer | avoid scaling in boiler | Filter/Softening |
What to consider when buying
- Capacity: how many litres until cartridge change – matched to your water hardness
- Bypass setting: good residual carbonate level for balanced coffee flavour
- Change interval: exhausted filters no longer protect – plan changes
- Connection: suitable for machine and water installation
Frequently asked questions
Do I really need a water filter?
From medium water hardness (above 8.4 °dH) yes – the filter costs a fraction of a calcified boiler repair and noticeably improves taste and appearance.
How often must the filter cartridge be changed?
Depending on capacity and water hardness – usually after a specified number of litres. Many systems have a change indicator.
Is reverse osmosis necessary?
Useful for very hard water or demanding barista quality. For normal operation, a good filter or softening is usually sufficient.
How do I determine my water hardness?
Via the local water supplier or with a test strip. The °dH then determine filter choice and change interval.
Water filters at Gastro-Nik
- Bartscher Water Filter KV1 – compact for small machines
- Bartscher Water Filter KV-150 – higher capacity
- Bartscher Water Filter System K1600 EW – for medium demand
- Bartscher Water Filter System K3600L – large capacity
Which water treatment suits your water hardness?
We help with filter choice, capacity and connection – for dishwasher, coffee and combi steamer.
Last updated on 12 July 2026.