Tiny, the orange box is a commercial fertigation controller a Hanna H9914, it only has relay outputs,, they don't supply power only switch it,and can only handle 2 amp. max. so I needed the relay box as the pumps pull 1.8 amp each.

I have found that in the grow cycle the Ph is on a constant rise so it needs dosed down(GH 3 part nuits) which Hanna says is normal.In the flower cycle the Ph rises for a couple of days then it starts dropping and needs dosed up constantly

Now depending on the EC and the feed schedule the rate of Ph change can be caused to change slower or quicker but the change is always in the manner discribed

This unit was not exactly what I wanted but had to settle for
because of the LOW EC I run 0.70, this is at the lower limit of the unit,other units could not be set that low

I wish I had bought an "Inteli-dose" unit, sold by American hydroponics. it is expensive but with all the work/headache I have gone thru, it would have been a bargin

The reason for the controller is my health is on the down hill

Daddy