of the pump in one embodiment the voltage rating of the battery is between approximately 20 to 50 of the voltage rating of the pump in another embodiment the voltage rating of the battery is approximately 33 of the voltage rating of the pump in this configuration the pump runs at slower speed than its maximum capacity and thereby extends the usable battery life of the device the battery is provided on the chassis and or within the body for example the battery may be positioned beneath the tank 8 and or underneath and between the tank 8 and the accumulator 30 in alternative embodiments the unit 2 is void of a battery and comprises a power cord directly connecting the pump 28 to an external power source as further shown in fig2 a pump supply line 24 is provided for conveying fluid from the tank 8 to the pump 28 the pump supply line 24 preferably comprises a flexible conduit that connects the tank 8 to the pump 28 such that solution can be gravity fed to the pump 28 although the line 24 is primarily gravity fed in a preferred embodiment one of skill in the art will recognize that pressure differentials induced by the pump may further induce or cause fluid flow a port is.