The modified basin still has the same dimensions and construction of conventional still. In addition, inside the still, there is the vacuum port to be able to measure the pressure inside the basin still by the pressure measurement instrument. Also, there is the vacuum fan and its output duct to the condenser as shown in Fig.1. The condensation unit consists of 3.0 m copper tubes with 3.81 cm diameter encased in polyethylene tank (40 x 40 x 50 cm) filled with cold water. The copper tube is terminated with graded container to collect the condensate water, as shown in Fig. 1. The used vacuum fan is of the axial-flow type. It has a blade diameter of 8 cm and was attached by a variable speed indicator on a screen to control the fan speed as shown in Fig. 1. The brushed DC electric motor was used to run the fan. It had a maximum rotational speed of 1440 rpm, power factor of 45°, and consumed 2 A and 12 V. The feed water tank is connected to the main line which is divided into two feed water lines. A flow control valve is integrated at each line inlet in order to regulate the flow rate of water as shown in Fig.1.