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Pure water flux holds an important key in determining the quality of a certain filter. The flux can be measured by pumping a number of volume fluid through some filter membrane over time. By using automation electrical control system, high accuracy sensor and over time sampling data, the error that occurred in manual data sampling will reduced, so the flux that occurred will be more accurate. This paper explains how the automation system using a controllable air regulator pressure pump with high precision pressure sensor, and high accuracy digital balance and the data received displayed in the Graphical User Interface (GUI) to get the flux of a filter membrane. The calibration process of the hardware that involves in this measurement gave good result with minimum or the lowest value of linear regression constanta is 1 for the bit digital balance number and mass number and 0.9998 for duty cycle read of the digital pressure and measured sensor calibrate pressure sensor. Also the accuracy number of the digital balance got by comparing the digital balance and calibrate scale, the highest number of error is 0.35% while the minimum value of mass number that could be recorded reached 0.003 gram. And for the flux measurement test on different type of filter membrane also shows that the different of membrane pore size affect the value of the flux and given increment of the pressure causes the value of flux increase.