Hi Esstee, forget about giving me the rest of the formulas for calculating the total run time. I realized you already posted a worksheet containing the formulas. I will study that later.
For now, could you please verify if my total wetted area calculation is correct? And how do I use this wetted area calculation with the nice ppm/run time calculator that you created? I'm trying to use your calculator but it seems the result it is giving is wrong.