There are 2 anti-scale systems for Laurastar products which vary by models: anti-scale cartridges and anti-scale granules for anti-scale water filters.

1) If you own a Laurastar ironing system Laurastar Smart

Anti-scale filter should be replaced when it turns completely brown.
To replace it, take out the cold water tank, remove the filter, place the new filter in the water tank and fill it with cold water up to the MAX level.

2) If you own a Laurastar ironing system (such as Laurastar S4a, Laurastar S5a, Laurastar S6a, Laurastar S7a or Laurastar Pulse, Laurastar S, Laurastar S PLUS, Laurastar S Xtra ):
Anti-scale granules for anti-scale water filter should be replaced when they turn completely brown. To replace them, take out the cold water tank and remove the filter. Take off the lower section and throw the used granules in the bin. Clean the filter thoroughly then refill the lower section with a new whole sachet of granules and replace the cover. Reattach the lower part from below. Put back the filter in the water tank and fill it with cold water up to the MAX level. Then place the water tank back in its holder.
Anti-scale granules refills can be purchased on Laurastar online store and service center.

3) If you own a Laurastar steam generator Laurastar Lift, Lift Xtra or Laurastar Lift +:
The anti-scale cartridge should be replaced when the red indicator light for the cartridge is turned on and a warning tone sounds.
Lift the cover of the water tank and remove the water tank by pulling on its cover. Empty out the water and remove the used anti-scale cartridge.
anti-scale cartridge and fill the water tank with tap water. Finally, validate the change by pressing the change cartridge switch.
Anti-scale cartridges can be purchased on Lauraster online store and service center.