Décalcifier belong to the 1
st group.
Décalcifier is conjugated the same way that verbs that end in :
-ier
Décalcifier is conjugated with
auxiliary avoir.
Décalcifier verb is
direct transitive.
French verb décalcifier can be conjugated in the reflexive form:
Se décalcifier
Décalcifier verb is a direct transitive verb, so passive voice can be used.