Explanation of code operation #39

I have the hardware and software installed. I have been manually adding acid and chlorine as needed based on the readings as provided in raspipool. I am ready to begin dosing the chemicals. However, I need a better understanding of how the programing logic operates and the logic flow. I am not referring to the code structure or syntax. I am referring to the raspipool logic, such as when does it dose, how does it determine how much and how often, what prevents a dosing from happening, etc. Could you.pleas provide such information or point me to a source of it? Thanks!