dear Ali, Have a look at ...

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dear Ali,

Have a look at the offerings from Hach, www.hach.com, as they do have off-the-shelf Real Time Controllers (RTC's) that can be used for dosing purposes.

https://www.hach.com/process-management/real-time-controls-rtc/family?productCategoryId=35547627776

The do also have TOC or COD (lab, on-line) offerings in their program too!

Best of luck and let me know if there's anything else.

Robert