Filter means for aquariums

Claim 1

AN AQUARIUM AERATOR AND FILTER COMPRISING IN COMBINATION, A FILTER CHAMBER HAVING ALIGNED TOP AND BOTTOM OPENINGS, A PACKING OF FILTER MATERIAL DISPOSED WITHIN SAID FILTER CHAMBER BETWEEN SAID TOP AND BOTTOM OPENINGS, A FLUID INLET CHAMBER HAVING AN OPEN TOP PORTION CONNECTED DIRECTLY TO SAID FILTER CHAMBER BOTTOM OPENING AND A CLOSED BOTTOM PORTION HAVING A CENTRAL EXTENSION OF TUBULAR FORMATION PROJECTING UPWARDLY FROM SAID BOTTOM PORTION THROUGH SAID FLUID INLET CHAMBER TO TERMINATE WITHIN THE LOWER PORTION OF SAID FILTER CHAMBER ADJACENT SAID FILTER PACKING SO AS TO CONSTITUTE A FLUID PASSAGE FROM THE EXTERIOR OF SAID FLUID INLET CHAMBER TO THE INTERIOR OF SAID FILTER CHAMBER, SAID FLUID INLET CHAMBER INCLUDING SIDE WALLS EXTENDING UPWARDLY FROM SAID BOTTOM PORTION IN SPACED APART RELATIONSHIP FROM SAID CENTRAL TUBULAR EXTENSION AND SPACED APART OPENINGS IN SAID SIDE WALLS CONSTITUTING FLUID PASSAGES TO THE INTERIOR OF SAID FLUID INLET CHAMBER, A STRAIGHT ELONGATED MAIN TUBE HAVING ONE END CONNECTED TO THE SAID TOP OPENING OF SAID FILTER CHAMBER WITH THE OTHER END OF SAID TUBE BEING OPEN FOR THE DISCHARGE OF AERATED FLUID AND AN AIR PRESSURE TUBE HAVING ONE END CONNECTED INTO SAID MAIN TUBE ADJACENT THE END IN CONNECTION WITH SAID FILTER CHAMBER.