CAPSULE FOR THE PREPARATION OF A NUTRITIONAL PRODUCT IN A DEVICE ADAPTED TO SUPPLY LIQUID IN THE CAPSULE, SAID CAPSULE COMPRISING: AT LEAST ONE COMPARTMENT (13) CONTAINING NUTRITIONAL INGREDIENTS FOR THE PREPARATION OF THE NUTRITIONAL PRODUCT IN COMBINATION WITH THE SUPPLIED LIQUID, A FILTER ADAPTED FOR REMOVING CONTAMINANTS CONTAINED IN THE LIQUID, WHEREIN THE FILTER IS FORMED AS A RELATIVELY RIGID FILTER UNIT (18) WHICH COMPRISES A FILTER MEMBRANE (20) AND AN OUTLET WALL (23) FOR SUPPORTING THE FILTER MEMBRANE; THE OUTLET WALL COMPRISING AT LEAST ONE LIQUID OUTLET (26) COMMUNICATING WITH THE COMPARTMENT (13). THE INVENTION ALSO RELATES TO THE FILTER UNIT (18) AS SUCH.