Firstly you need to ...

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Firstly you need to calculate the mass of alkalinity in your cooling water (CW) system. Then you calculate what the make up and blowdown rates are per 24 hours and the mass of alkalinity for both. Add the raw water alkalinity to the total alkalinity and subtract that lost to blowdown. Subtract the mass of alkalinity at the specification value. The remainder will be the mass of alkalinity required to be neutralised to meet that specification. Calculate the mass of sulphuric acid required to neutralise it and divide by 24. Set your dosing pump to deliver that value per hour. 

 

Note that this assumes that your only source of make up is raw water. If you have varying sources of make up, it is WAY more complicated and you're best off installing an alkalinity analyser and controlling your dosing pump using the analyser analogue output.