For the longevity of your WMF machine, and health and hygiene for your customers, regular equipment cleaning and specifically descaling in this occasion is not up for debate. Avoid any build up of limescale within your machine by descaling your machine as regularly as possible.
Mixing Ratio 1 : 1,5
750ml = 5 descaling doses
Depending on water hardness where you are located it is based you descale under the following timeframes:
1) Very hard water: every 3 weeks
2) Hard water: every 4 weeks
3) Soft to medium water: every 5 weeks