I modeled mine after Todd's method. Autotop off by float in my sump, and another float in my autotop of tied directly to my RODI unit. I had to lower the bulb in the auto top off to prevent kalk build up and shutting off my RODI feed. I put in a few large spoons every now and then to keep saturation to a light milky color. I came back home after two weeks of TDY and my top off was clear and my purple tip valida was burned. I had another sps that burned a bit. But everything seems to be recovering well.

When I mix heavy I notice a lot of new growth in my sps, lot of white tips stretching out. I imagine that I'll get a lot of growth over the winter with the drier air inside. I don't dose to keep PH steady, just for the supplementation and the ph is a side benefit.

About every two months I'll get in there and do some maintenance on the floats and lines to keep them clear of kalk, and I have a pump running 24/7 in the auto top off to keep the stuff stirred. I ruined a K4 in there, but it was old and had been in my possesion used for a couple of years. I think that compiled with the nature of kalkwasser finally led to its demise.

I put in a small handful of epsom salt to keep mag up... but I don't test for it. I do this about once a month .