The control of the pH process plays an important role in wastewater treatment or cell growth rate in biological systems. However, pH control has been a difficult problem due to its nonlinearities and time-varying properties. Many authors proposed nonlinear pH control strategies to overcome these drawbacks. However, their methods’ complicated control structures make practical implementation difficult. Therefore, in this study, we propose a new control strategy using a simple set point change. The proposed method has short identification time and reduces the effects of noise by considering many data points.