Without at lot of information ...

Without at lot of information supplied and depending on the sophistication of the dosing control you should be able to reduce the use of HCl while maintaining optimum control. Using a 4-20mA proportional control signal directly from the pH controller. Set the zero output (4mA) to just below the upper range (if range is pH 6 to 8) set it say at pH7.5. Set the 20mA value to pH 9. The dosing pump will aim to maintain the pH at 7.5 using a variable speed dosing pump.