Vacuum and/or pressure drum filtering device for filtering a solid material from a suspension formed by the solid material and a liquid, comprising: - a filter drum , comprising - a drum-shaped inner base body which is made of an at least for the most part rigid base body material and which defines a base body longitudinal axis (L), and - a drum-shaped outer functional body which is made of an at least for the most part rigid functional body material and which surrounds the inner base body , thereby forming a fluid-tight encapsulation of the inner base body , wherein - the inner base body is surrounded by the outer functional body at least for the most part abutting in a form-fitting manner and for the most part not adhering to the inner base body , so that the outer functional body at least for the most part forms an outer covering of the inner base body , which does not rest against the inner base body in a fluid-tight manner, which, however, is supported by the inner base body against external forces, and - one or more pipes for discharging the liquid from the filter drum , which are respectively attached to the outer functional body and which are respectively attached to the inner base body at least for the most part only indirectly via the outer functional body . - a filter drum , comprising - a drum-shaped inner base body which is made of an at least for the most part rigid base body material and which defines a base body longitudinal axis (L), and - a drum-shaped outer functional body which is made of an at least for the most part rigid functional body material and which surrounds the inner base body , thereby forming a fluid-tight encapsulation of the inner base body , wherein - the inner base body is surrounded by the outer functional body at least for the most part abutting in a form-fitting manner and for the most part not adhering to the inner base body , so that the outer functional body at least for the most part forms an outer covering of the inner base body , which does not rest against the inner base body in a fluid-tight manner, which, however, is supported by the inner base body against external forces, and - a drum-shaped inner base body which is made of an at least for the most part rigid base body material and which defines a base body longitudinal axis (L), and - a drum-shaped outer functional body which is made of an at least for the most part rigid functional body material and which surrounds the inner base body , thereby forming a fluid-tight encapsulation of the inner base body , wherein - the inner base body is surrounded by the outer functional body at least for the most part abutting in a form-fitting manner and for the most part not adhering to the inner base body , so that the outer functional body at least for the most part forms an outer covering of the inner base body , which does not rest against the inner base body in a fluid-tight manner, which, however, is supported by the inner base body against external forces, and - one or more pipes for discharging the liquid from the filter drum , which are respectively attached to the outer functional body and which are respectively attached to the inner base body at least for the most part only indirectly via the outer functional body . <EOS>