With the KH Director you need at least a 3 to 4 pump head dosing pump.Love that you're getting on board with the KH Director, im keen as to see how it and all the other KH monitors go over the long term.
I think i read this right somewhere, but the KH Director can control each pump head to dose a 3 part instead of just ALK yea?
3 pumps will be used to supply the KH Director (1 x tank water supply, 1 x reagent supply, 1 x water removal). The 4th pump can be used to dose ALK to the sump/tank.
So if you want to use 3 part dosing, you need an extra second pump with at least 2 heads.
The nice thing is that, as far as I understand, if you chose the stand alone GHL doser 2.1 together with the KH Director, you do not need the Profilux controller.
@choss, did you order the stand alone or slave pumps?