A pre-filter with a 5 micron filter cartridge is installed at the inlet of your water circuit. Its function is to retain muddy residues and sediments that may be present in the water network. After rinsing the cartridge, the water becomes “clear” again.
The OLEO plant, on the other hand, is a decalcifier and once it is activated, its action acts directly on the scale and on the whole of your installation, such as the hot water tank, the boiler or the water heater. This is why the water may appear whitish for a few days. This effect disappears with time.