If you notice a brown deposit or what appears to be rust in your heating reservoir, this may be limescale (mineral found naturally in water). Your Babycook reservoir is made out of stainless steel, so will not rust providing proper care and maintenance instructions provided have been followed.
To correct any limescale residue, you will need to descale your appliance. Instructions for descaling can be found in your product manual or on this website.
Slight discolouration of the tank is normal over time, similar to a household kettle.
If you have descaled your Babycook and it is steaming and cooking food, then this discolouration is completely normal.
*Please note: Lime scale is not toxic to your infant