Membrane elements replacement
Before replacing the cartridges power off the unit using the switch on the front panel.
Exhausted cartridges removal
Remove the cartridges from the holders by turning them counterclockwise.
New cartridges mounting.
Take new cartridges out from packaging, remove protective caps, place the cartridges in the holders by turning them clockwise until you can go no further.
Flushing.
Flush the new cartridges according to the instructions