Abstract: A filter device for a plurality of liquid or gaseous fluid samples containing particles to be filtered, the device comprising a stand, at least one filter, upstream and downstream clamping blocks cooperating wit the filter and designed to be fixed together with an interposed perforated sealing gasket and are configured to be inserted through an opening in the stand, forced filtering mechanism and filtrate evacuation mechanism. The upstream clamping block is a removable independent tank block for enabling pretreating of samples introduced in wells thereof.