Abstract: The invention relates to a filter device (10) serving to filter a liquid, in particular for treating water. The filter device comprises: at least two plate-shaped filter elements (12) and at least one holding element (20) for filter elements (12). According to the invention, the holding element (20) comprises a holding frame (22), a grout material (26), and an end unit (24), which is separate from the holding frame (22), wherein the grout material (26) is arranged between the filter elements (12) and the holding frame (22), such that the grout material seals the filter elements (12) against the holding frame (22), that the end unit (24) is fastened on the holding frame (22) in a liquid-tight manner, and that the holding frame (22) and the end unit (24) delimit a liquid collection chamber (40).