Question

The anti-calc cartridge changes colour gradually as I use the IronCare water descale filter. Is this normal?

Answer

Yes. This is normal. The colour of the material inside the anti-calc cartridge changes from blue when the anti-calc cartridge is new to brown when it has been used for some time.
When the anti-calc cartridge has turned completely brown, you have to replace the anti-calc cartridge with a new one.

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