You must be dosing a lot of two part. I had the same issue until I switched to carx.Just checked... 37. I dont know why it seems so hard for me to get it to stay at 35. It's consistently 36 and on a slow climb all the time. Thanks to this thread, I've started adjusting by pulling 500ml 4x (over 24 hrs) and replacing with 0 ppt ATO. I do this from time to time as needed. It's a 250 liter system. And I dose AB @ 30ml/day.