As a verb descale
is to remove scale from the surface of a metal, especially from the inner surfaces of boilers etc.
As an adjective undescaled is
not descaled; from which scale has not been removed.
descale
English
Verb
(descal)
To remove scale from the surface of a metal, especially from the inner surfaces of boilers etc.
To remove the scales from a fish etc.
undescaled
English
Adjective
(-)
Not descaled; from which scale has not been removed.