Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

I don't think he meant titration on the makeup water just a simple PH test with strips. I don't know anything about the best chemistry in a radiator but I was an engineer lab tech for navy boilers and nuclear reactors for 11 years. We actually used a high ph in the boilers, around 10.5 but we are talking boiling water not just hot water. We used common trisodium phosphate or TSP, like they sell in a paint store for cleaning, that takes the hard water minerals and makes a soft sludge that can be removed and also maintains a buffered ph in the 10.5 area. Conductivity, chloride, and dissolved oxygen are also bad things we look for. That's for low pressure boilers and by low pressure we are talking 600-700psi and 450 degrees or more. That's a big difference compared to a radiator and the materials are different as well so, like I said I don't know radiators.
The nuclear reactor chemistry is completely different, the water there is hotter but under so much pressure it does not boil. The chemistry control there makes my head hurt to try and remember.

Personally I like 50/50 tap water and antifreeze with an expansion tank so you don't have air in the system in my car. Then again freezing is a much bigger problem in Montana then overheating and I do have a water softener so there you go!