Pressure filter for aquariology for retaining impurities of the water intended for ponds, aquaria and the like, of the type comprising a glass-like container (12) closed by a cover (14), a liquid path (15) extended in the container between an inlet opening (16) and an outlet opening (17), a filtering body (18) placed along the path and having an exposed surface (19) whereon the impurities are retained, and at least a brushing element (31) mounted in the container in a guided way with to-and-from movement along the exposed surface (19) for removing the impurities, characterized in that the brushing element (31) is mobile against the exposed surface (19) for maintaining a pressing contact between the brushing element (31) and the exposed surface (19).