Philips L'Or Barista Sublime LM9012/00 Mode D'emploi page 16

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We advise you to use the dedicated L'OR Barista liquid descaler (CA6530). It
is available in bottles that contain liquid descaler for two descaling
procedures. You need half a bottle for one descaling procedure and can
store the other half for the next descaling procedure.
Descaling procedure
Note: If something goes wrong during the descaling procedure, e.g. because
you accidentally interrupt the descaling cycle, you have to restart the
descaling procedure from step 1.
1 Pour half a bottle of L'OR Barista liquid descaler (CA6530) into the water
tank.
2 Fill up the water tank with fresh tap water.
3 Make sure that there is no capsule in the capsule compartment.
4 Close the lever.