Abstract: A wet-dry vacuum apparatus is disclosed for continuously picking up liquid and conveying it into a tank and for simultaneously removing the liquid from the tank when necessary. The apparatus includes a tank for holding liquid. The tank includes a vertical drum, a removable cover for closing the upper end of the drum, and a bottom plate for closing the lower end of the drum. A motor driven vacuum pump is mounted on the cover for sucking liquid to be picked up into the tank through an inlet opening into the upper end of the drum. The apparatus further includes a liquid pump, driven by an electric motor, in the tank carried by the cover for discharging liquid from the tank under pressure through an outlet opening in the cover. A first float, positioned in the tank, closes a first switch, which electrically connects the liquid pump to a power source, when a first predetermined liquid level in the tank is reached to thereby actuate the liquid pump to discharge liquid from the tank.