The replacement operation is similar to the installation operation and you will have to remove the old mixer and prepare the seat.

Let's see in detail:

1. Close the general tap supplying the mixer.
2. Remove the old mixer by unscrewing the fixing nut from under the sink
3. Remove the hot and cold water pipe joints
4. Clean the surface gently with a spatula to remove the traces of limestone that form around the mixer.
5. Proceed to refit the new mixer
6. If the flexible fittings are damaged replace them by unscrewing the data through which they are connected to the fixed pipeline (on the wall)