Right now my TA is right around 120 (starts turning red at 11 drops, doesn't change anymore after 12), so I think I'd like to play around with lowering it a bit (I say playing because pool re-plastering is coming in the next couple of weeks, but I want to get the feel for adjusting these things while it doesn't matter as much). I understand the noted way to do this is to lower to 7.0-7.2 and aerate, but do I really have to go that low, or is that just the most efficient level to go to? I was at 7.8 a few days ago and added some MA to lower it to 7.5, and wondering if bouncing between 7.8 and 7.5 will have the same effect, or if there's something special about getting closer to 7.0 here...