I was told only one per master device due to the complexity of the kh director. I actually own 2 of the kh directors and plan to run my 2nd one off of a stand alone 2.1 doser. Would be nice for them both to be displayed under the profilux, but Matthias and Vinny said this isn't possible.
Yes sir! I just set up another tank down in the basement with expansion box, etc. So I plan to have everything controlled under my profilux for both tanks besides the kh director (on my 2nd tank). I will just have to log into the doser 2.1 to monitor the alkalinity on that one.
If that ever changes in the future I will just switch the stand alone doser over to slave and have the 2 kh directors run under the profilux. I'm not sure if GHL meant not possible period, or not possible for right now? Either way, for me and my setup, I think it will be just fine running with the stand alone.