restriction 41 which extends at an angle into pipe 37 fig4 diagrammatically illustrates the outline of a pool showing a coping 47 and employing a skimmer 45 a drain 46 with standard piping 36 a pump 38 a filter 39 air pump 27 jet piping 37 control valve 42 and the return pipe 43 suggested locations for the rotating jets 44 on a large pool for example 22 39 by 44 39 is shown to clean pool liquid with this method suitable fittings are attached to the interior surface of the pool and connected to a system of pressurized liquid normally the return side of the pool filter and normally all the jets are maintained on whenever the filter is in operation the pool filter pump 38 pulls the liquid from the skimmer and drain of the pool through pipe 36 to the pump 38 at the pump 38 the liquid is put under pressure and flows through filter 39 where dirt is removed the liquid then flows back to the pool through pipe 37 to pipe 2 into cylinder 1 through pipe 13 and out nozzle 6 and across the pool surface thereby sweeping the interior surface of the pool after a time for example 15 seconds the electric control valve 33 on the air pump opens the opening and closing of the electric control valve 33 is accomplished by a suitable timing device such as those used on automatic washing machines as valve 33 opens pressure liquid enters pipe 34 the air valve 35 closes and cylinder 27 begins to fill with liquid as cylinder 27 fills the float valve 29 at the bottom of the cylinder opens this is caused by the buoyancy of the float overcoming the suction of the pump.