Pressure filter for aquariology

1. Pressure filter for aquariology for retaining impurities of a liquid intended for ponds, aquaria and the like, of the type comprising:

a beaker-like container closed by a cover;

a liquid path extended in the container between an inlet opening and an outlet opening;

a filtering body placed along the path and having an exposed surface whereon the impurities are retained;

at least a brushing element mounted in the container in a guided way with a to-and-from movement along the exposed surface of the filtering body for removing the impurities, the brushing element being mobile against said exposed surface for maintaining a pressing contact between the brushing element and the exposed surface, wherein the brushing element is angularly mobile around an axis substantially parallel to said exposed surface; and

a control rod swiveling around said axis, for angularly moving said brushing element against the exposed surface.

2. The filter of claim 1 , wherein said control rod is adapted to guide said brushing element with said to-and-from movement along the exposed surface.

3. The filter of claim 2 , comprising a grip handle for said control rod.

4. The filter of claim 2 , comprising servo assisted motor means for the activation of said control rod.

5. The filter of claim 1 , wherein the control rod is fixed in a substantially central position of said brushing element for dividing it in two portions and allowing an alternating rotation of the one and of the other portion toward-and-away with respect to the exposed surface.

6. The filter of claim 1 , wherein said control rod is mounted passing through a respective calibrated hole made in the cover.

7. The filter of claim 1 , wherein said control rod is fixed in an eccentric portion with respect to said brushing element in correspondence with one of the terminal portions of the brushing element.

8. The filter of claim 1 , wherein said brushing element comprises on one side facing said exposed surface a plurality of flexible tabs.

9. The filter of claim 1 , wherein said brushing element has a substantially semi-ring-like shape.

10. The filter of claim 9 , wherein the filtering body has a substantially circular section and it is arranged in a substantially central area of the container defining an annular chamber wherein the brushing element is guided in a sliding way.

11. The filter of claim 10 , comprising two semi-ring-like brushing elements placed on opposite parts with respect to the filtering body.

12. The filter of claim 11 , wherein said two brushing elements substantially form a ring, which coaxially surrounds the filtering elements.

13. The filter of claim 12 , wherein the ring formed by said two semi-ring-like brushing elements has a diameter smaller than the outer diameter of the filtering body.

14. The filter of claim 1 , wherein said filtering body comprises sponges of polyurethane with open cells.

15. Pressure filter For aquariology for retaining impurities of a liquid, of the type comprising:

a container;

a filtering body having an exposed surface whereon the impurities are retained;

at least a brushing element mounted in said container and guided along the exposed surface of the filtering body for removing the impurities; and

a control rod, which is adapted to guide said brushing element along the exposed surface and to swivel it around said axis,

wherein the brushing element is swiveling around an axis substantially parallel to said exposed surface so that it is alternatively moved toward-and-away with respect to said exposed surface, and

wherein two brushing elements are provided and are arranged on opposite sides with respect to said filtering body, each of the brushing elements having a semi-ring-like shape.

16. The filter of claim 15 , wherein said control rod is fixed in a substantially central position of the brushing element for dividing it in two portions and allowing an alternating rotation of the one and of the other portion toward-and-away with respect to the exposed surface.

17. The filter of claim 15 , wherein said control rod is fixed in an eccentric portion with respect to the brushing clement in correspondence with one of the terminal portions of the brushing element.

18. The filter of claim 15 , wherein said brushing element comprises on one side facing the surface a plurality of flexible tabs.

19. The filter of claim 15 , wherein said filtering body has a substantially circular section and it is arranged in a substantially central area of the container defining an annular chamber wherein each of the semi-ring-like brushing elements is guided in a sliding way.