Abstract: A portable pool cleaning system for cleaning the surfaces of swimming pools and surrounding decks without draining the pool water. The system includes a cart for containing an electrically powered pump, a line to an external source of muriatic acid or another suitable swimming pool cleaning agent and a line to a clean water source. The system also includes a cleaning wand having a cleaning head for engagement with the pool walls and floor. A valving system is used to regulate the flow of a cleaning agent through the system, to dilute the muriatic acid with water from the clean water source, and to recirculate through the system any unused portion of muriatic acid which is prevented from flowing to the cleaning wand. The valving system further allows the operator to flush the system with clean water before withdrawing the cleaning wand from the pool water.