Filter aid feed system

Claim 1

IN COMBINATION, A FILTER HAVING A SEPTUM, MEANS FOR SUPPLYING LIQUID TO BE FILTERED TO SAID SEPTUM, A FILTER AID BODY FEED SYSTEM INCLUDING A SOURCE OF FILTER AID SUSPENSION, A FIRST CONDUIT FOR CONDUCTING SAID FILTER AID SUSPENSION TO SAID SEPTUM, AN EDUCATOR IN SAID FIRST CONDUIT, AN AUXILIARY CONDUIT INCLUDING A VALVE CONNECTING SAID SOURCE OF FILTER AID SUSPENSION WITH THE SUCTION OF SAID EDUCATOR, AND MEANS FOR SUPPLYING DILUTING LIQUID TO SAID AUXILIARY CONDUIT BETWEEN ITS VALVE AND THE SUCTION OF SAID EDUCATOR, A PRECOAT SYSTEM INCLDING A SECOND CONDUIT FOR CONDUCTING SAID FILTER AID SUSPENSION TO SAID SEPTUM, AN EDUCATOR CONNECTED IN SAID SECOND CONDUIT, A VALVE CONNECTED IN SAID SECOND CONDUIT ON THE DOWNSTREAM SIDE OF SAID EDUCATOR, A SECOND AUXILIARY CONDUIT CONNECTING SAID SOURCE OF FILTER AID SUSPENSION WITH THE SUCTION OF THE LAST MENTIONED EDUCATOR, A VALVE CONNECTED IN SAID SECOND AUXILIARY CONDUIT, AND MEANS AUTOMATICALLY CAUSING DELAYED ACTION OPENING OF SAID SECOND AUTOMATICALLY CAUSING DELAYED SECOND AUXILIARY CONDUIT VALVE, AND DELAYED ACTION CLOSING OF THE LATTER RELATIVE TO SAID SECOND CONDUIT VALVE, A FLOAT CONTROLLED TANK OPEN TO ATMOSPHERE, CONNECTED IN SAID FIRST AND SECOND CONDUITS DOWNSTREAM OF SAID EDUCATOR AND UPSTREAM OF SAID SEPTUM, AND RECEIVING THE DISCHARGE FROM SAID EDUCATORS, AND MEANS SUPPLYING ADDITIONAL DILUTING LIQUID TO SAID TANK, SAID FLOAT BEING OPERATIVE TO PROVIDE A CONSTANT HEAD OF LIQUID AGAINST WHICH SAID EDUCATORS DISCHARGE.