12EQUIPMENT MAINTENANCEGeneral Keep the bath free of oils, grease and any foreign materials. Skim off oil and grease residue periodically, if necessary. Cleaning agents should be changed periodically depending on usage. The Omegasonics unit is maintenance-free. Check the casing and the main electricalcable for damage regularly in order to prevent electrical accidents.Draining Tank Turn equipment off and unplug the power cord. Wait at least twenty (20) minutes after the heat is turned off before emptying the tank.Permanent damage to the heater elements will occur if the tank is drained too soonafter the heaters are turned off. Unscrew (counterclockwise) the plastic screw cap. Screw (clockwise) the tube socket (included in the package) onto the inside thread of thedrain outlet.