Modular filter and automatic chlorinator for swimming pools

Claim 1

A COMBINED POOL FILTER AND CHLORINATING UNIT USING CHLORINE PELLETS COMPRISING: A FLUID-TIGHT HOUSING HAVING AN INTERMEDIATE WALL DIVIDING THE HOUSING INTO AN UPPER CHAMBER AND A LOWER CHAMBER, THE WALL HAVING A CENTRAL OPENING THEREIN, MEANS ADMITTING POOL WATER INTO THE LOWER CHAMBER OF THE HOUSING ADJACENT THE SIDES THEREOF, A CENTRAL OUTLET TUBE EXTENDING VERTICALLY UPWARDLY FROM THE BOTTOM OF THE HOUSING THROUGH THE OPENING IN THE INTERMEDIATE WALL INTO THE UPPER CHAMBER, THE TUBE HAVING A DIAMETER SMALLER THAN THE CENTRAL OPENING IN THE INTERMEDIATE WALL, A REMOVABLE ANNULAR FILTER ELEMENT IN THE LOWER CHAMBER EXTENDING AROUND THE TUBE IN SPACED RELATION TO THE TUBE AND TO THE CHAMBER WALLS, MEANS PROVIDING A SEAL BETWEEN THE LOWER END OF THE FILTER ELEMENT AND THE OUTLET TUBE ADJACENT THE BOTTOM OF THE LOWER CHAMBER, MEANS PROVIDING A SEAL BETWEEN THE UPPER END OF THE FILTER ELEMENT AND THE INTERMEDIATE WALL, WHEREBY POOL WATER ADMITTED TO THE LOWER CHAMBER MUST PASS RADIALLY INWARDLY THROUGH THE FILTER TO REACH THE OUTLET TUBE, THE TUBE HAVING A RESTRICTED OPENING INTO THE TUBE ADJACENT THE UPPER END ABOVE THE INTERMEDIATE WALL FOR CONTROLLING THE RATE OF FLOW OF WATER THROUGH THE UPPER CHAMBER, WHEREBY WATER PASSING THROUGH THE FILTER RISES ALONG THE EXTERIOR OF THE TUBE INTO THE UPPER CHAMBER TO ENTER THE TUBE, SOLUBLE CHLORINE PELLETS IN THE UPPER CHAMBER SUPPORTED BY THE INTERMEDIATE WALL, AND AIR-TIGHT REMOVABLE MEANS PROVIDING ACCESS TO THE UPPER CHAMBER FOR LOADING THE PELLETS IN THE CHAMBER.