How do I know when the anti-scale filter needs to be replaced?

The anti-scale filter must be replaced after approximately 11 hours of steam ironing operation. When replacement is due, the self-cleaning and anti-calc indicator [9] lights up continuously. It is recommended to always keep a replacement filter available if you use the product regularly. (Page 15-16)

From the official Silvercrest Sdsb 2400 A1 Steam Generator Iron manual, page 15

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