Firstly, thanks a lot for the detailed answer. I'm feeling much better already. You make that kind of investment in something, last thing you need is for things to go to **** in the first two weeks!
OK, in all likelihood that was my problem, I didn't keep the chlorine level high enough in the first couple weeks (i'm going on third week now) and so the chlorine level was getting low very fast even though it got super high after I put a few scoops of granules in it. Now that it's been a few weeks and in the past days I made sure to put more granules more often, it seems like FC is getting more stable.
That's good to know. I was trying to follow the recommendations in the manual that state 100-150pm are optimal levels. I'll look into lowering it if pH doesn't stabilize, it's been a bit better lately, it rises a bit, but not the wild swings I was getting before.
I have the K-2006 with FAS_DPD, so not the Bromine one. I did read about multiplying by 2.25 for Bromine so that's what I've been doing. One thing I'm still not sure of, is there a way to know that I've built that bromide bank? And once built, I assume it will get depleted, but is it at a pretty slow rate? Could I just use a floater most of the time and then once in a while drop some of my granule solution instead to add some sodium bromide?