Depending on its quality, there are various ways water can be treated to prevent those effects: it can be softened, for example, or the salts can be partially or totally removed. Combined with top-class MEIKO washing technologies, each of these methods produces excellent results. We take our cue from recommendations drawn up by our German trade association, the VGG.
These include values for the total content of mineral salts in the water:
- max. 400 µS/cm – for porcelain and opaline glass
- max. 100 µS/cm – for glass
- max. 80 µS/cm – for stainless steel
(measured through conductivity)
Comparison of water treatment methods
Impact of different treatment methods on water
Benefits of treatment
- Very good results after washing
- No calcium smears on washware
- No damage to machines or lost time due to limescale
- Longer service intervals
- Lower consumption of cleaning agents
- Lower consumption of rinse aids
- Lower chemical loads in wastewater, helping to protect the environment
- No manual polishing of glasses or cutlery, which saves work, cuts costs and reduces breakage.
How we define hardness
|Category*||Overall hardness in mmol calcium carbonate per litre (mmol/l)||Overall hardness in German hardness degrees (°dH)|
|I||soft||less than1,5||less than 8,4|
|II||medium||1,5 to 2,5||8,4 to 14|
|III||hard||more than 2,5||more than 14|
* Since May 2007 water hardness has been divided into three categories: soft (category I), medium (category II) and hard (category III). The indication German hardness degrees (°dH) was replaced by the European indication mmol calcium carbonate per litre (mmol/l). Water should be treated from 0.54 mmol/l calcium carbonate (formerly 3 °dH) upwards.