This system was used two tanks, which were main tank and hydroponics tank. The position of the hydroponics tank was placed above the main tank so that the water solution in the hydroponics tank could be easier to transfer back into the main tank for the rechecking the pH level in water solution after a certain period. By this way, to transfer the water solution into the main tank can be done by solenoid valve. It made the cost of the project can be reduced. To stand the pH adjuster dropper and stirrer, the PVC pipes were used.