If the pressure is also fluctuating when voltage is doing so andif you have the 24V/220V DUO model, the cause is probably a slipping uni-directional bearing.toggle quoted messageShow quoted text
So far, I have changed several pulleys (sold 185 euros by Dessalator) and then opted to change the uni-directional SKF bearings only, with the same results. These bearings are probably not suited for this use.
Finally decided this year to use the desalinator in 24 V mode only and disconnected the belt on the 220V side.
To prevent further bearing slipping on the 24 V side, got the bearing “frozen” by welding it and, for the first time in 12 years, the desalinator worked well for two consecutive months.
S.V. Amelia II (A54)