Filter systems

Claim 1

A FILTER SYSTEM FOR A CONTAINED QUANTITY OF LIQUID COMPRISING A FILTER VESSEL INCLUDING A FILTER ELEMENT DEFINING AN INLET CHAMBER IN SAID VESSEL ON THE INLET SIDE OF SAID FILTER ELEMENT, THE OUTLET SIDE OF SAID FILTER ELEMENT BEING IN COMMUNICATION WITH SAID CONTAINED QUANTITY OF LIQUID, FLOW DISTRIBUTING MEANS INCLUDING AN EDUCATOR HAVING AN INLET CONNECTION, AN OUTLET CONNECTION AND A SUCTION CONNECTION, FIRST CONDUIT MEANS CONNECTED BETWEEN SAID FILTER INLET CHAMBER AND THE SUCTION CONNECTION OF SAID EDUCTOR, SECOND CONDUIT MEANS CONNECTED TO SAID OUTLET CONNECTION OF SAID EDUCTOR, SAID VALVE MEANS IN SAID SECOND CONDUIT MOVABLE BETWEEN OPEN AND CLOSED POSITIONS FOR CONTROLLING FLOW THROUGH SAID SECOND CONDUIT MEANS INCLUDING A PUMP WITHDRAWING LQUID FROM SAID CONTAINED QUANTITY OF LIQUID AND DELIVERING IT UNDER PRESSURE TO SAID EDUCTOR INLET CONNECTION WHEREBY SAID LIQUID IS DIRECTED BY SAID DISTRIBUTING MEANS TO FLOW TO SAID FILTER THROUGH SAID FIRST CONDUIT MEANS IN ONE DIRECTION WHEN SAID VALVE MEANS IS CLOSED AND TO FLOW BETWEEN SAID EDUCTOR INLET AND OUTLET CONNECTIONS WHEN SAID VALVE MEANS IS OPEN TO DRAW LIQUID FROM FILTER THOURGH SAID FIRST CONDUITS MEANS IN A DIRECTION OPPOSITE SAID ONE DIRECTION, AND MEANS FOR SUPPLYING FILTER AID TO SAID MEANS FOR WITHDRAWING LIQUID FROM SAID CONTAINED QUANTITY OF LIQUID FOR DELIVERY TO SAID DISTRIBUTING MEANS TO FORM A COATING OF FILTER AID ON THE INLET SIDE OF SAID FILTER ELEMENT.