Abstract: Hydraulically operated low pressure reservoir or pool cleaning method and apparatus wherein, by the controlled passage of water through actuating valves, plural water exhaust whips are submersibly extended from a pool shell into the closure to agitate the pool water and scour the shell walls and floor, thereby to perform the cleaning function. The whips may thereafter be retracted into the walls and floor and retained, pending further useage as extended cleaning elements. Method and apparatus present economies of operation and installation, hitherto unknown.