Not much, you are right. Most of it boils down to opinions on what is better, and opinions on pros/cons on each approach, which varies with setup/personality/goals/etc. Maybe fun to argue about, but gets old, and no expectation of some grand solution. The key disagreement that I wish we could prove would be if scrubbers truly kill SPS. I would say evidence is weighted toward yes, but so many holes in those arguments, and so many counter arguments, it is too hard to tell. --- Good point about Scientology and that scrubber site. I did end up posting there, quite nicely I thought. He kinda went off the deep end, talking about girls dying from drinking too much water. Really! --- Minor responses: You misquoted a bit, the vodka dosing was what I said could kill things if done wrong. I ran a vertical first, switched to a 30-deg horizontal, which I have now, but regret due to lower performance.