In planting plants using an aquaponic system, plants are very dependent on nutrients found in water and pH value. The pH value becomes one of the parameters that determine the yield. The pH value for aquaponic must be maintained in the range between 5.5 to 6.8. To maintain the pH of the environment, the water is treated with an acidic solution and the pH needs to be measured hourly. An automation system named AquapHR V1 is designed to keep the pH always at a predetermined range and has been set as the objective of this innovation. The product uses an Arduino wired up at a pH meter to detect the pH level of the hard water in the aquaponic system. When the pH meter reading is in the undesirable range, the product will trigger the motor to turn on the pump to add either the acid or base solution in the required amount into the water system so that the water pH reading will return to normal levels. The buzzer in AquapHR V1 will emit a loud and short beep sound if the water content is deficient in acid solution while it will sound loud and long beep if the base solution is deficient. It is believed that the presence of this automation system would be beneficial to the farmers in managing the water conditions in the aquaponic plant system in a simple and fastest way. In turn, they would produce quality and better yield, increasing productivity and revenue.