TF-Pro just arrived today. I'm used to the cheap HTH style kits. I didn't have a problem with the TA test (it came in at 130). The PH test was just like the common kits so that was easy. My PH measured at 8.2 so I know I need to add acid. How do I figure out how much acid is needed? Doesn't the TF-Pro have an acid demand test? That seems to be a big miss on the TF team that creates the kits?