Water treatment system

Claim 1

FOR USE IN A SYSTEM FOR INHIBITING THE GROWTH OF ALGAE IN SWIMMING POOLS AND THE LIKE FOR OPERATING WITH A UNIFORM FLOW POOL WATER RECIRCULATING PUMP HAVING A BY-PASS CONDUIT EXTENDING BETWEEN THE OUTLET AND INLET PORTS OF THE PUMP, THE IMPROVEMENT COMPRISING IN COMBINATION WITH A SOURCE OF DRY INERT GAS, A UNIT INCLUDING A CHAMBER IN WHICH SAID INERT GAS IS ACCUMULATED HAVING A VALVE PORT AT ITS UPPER END, A VALVE MEMBER FOR OPENING AND CLOSING SAID VALVE PORT, A MEANS FORMING CYLINDRICAL CHAMBER ABOVE AND IN AXIAL ALIGNMENT WITH THE PORT OF SAID GAS ACCUMULATING CHAMBER, MEANS AT THE LOWER END OF SAID CYLINDRICAL CHAMBER FORMING A BY-PASS FLUID CONDUCTING CONNECTION FOR COMMUNICATING WITH THE DISCHARGE SIDE OF SAID POOL WATER CIRCULATING PUMP, A SECOND MEANS FORMING AN OUTLET AT THE UPPER END OF CYLINDRICAL CHAMBER HAVING A CONNECTION FOR COMMUNICATING WITH THE INTAKE SIDE OF SAID PUMP, WHEREBY WATER FLOWING IN SAID BY-PASS CONDUIT WILL CIRCULATE IN AN UPWARD DIRECTION IN PASSING THROUGH SAID CYLINDRICAL CHAMBER, AND A FREE FLOATING PISTON-LIKE MEMBER POSITIONED BETWEEN THE INLET AND OUTLET PORTS OF SAID CYLINDRICAL CHAMBER HAVING AN OPERATING CONNECTION WITH THE VALVE MEMBER AT THE OUTLET PORT OF SAID GAS ACCUMULATING CHAMBER, SAID PISTON-LIKE MEMBER BEING RESPONSIVE TO UPWARD SURGES OF WATER IN SAID CYLINDRICAL CHAMBER AND OPERATING TO PERIODICALLY INTRODUCE GAS FROM SAID GAS ACCUMULATING CHAMBER INTO SAID CYLINDRICAL CHAMBER UPON EACH UPWARD MOVEMENT THEREOF.