Thanks
@rajkm. You confirmed what I thought about the Ca being Ca, regardless of how it's presented. I've also seen debates over NO3 being different than NO3, which also never made sense.
So, any binding (which was not my initial concern), is simply due to the 'bad' chelates introduced from our micros, be it EDTA, DTPA HEEDTA, etc. In my case, that's even less of a concern because I mix my own traces and use Fe gluc.
Your statements raise a different concern, though. With the Ca being made available much more quickly from the gluconate separation, maybe it would be better (although probably not noticeable) to add a small amount of Ca gluc daily, along with my Fe gluc and other traces, rather than front loading it in my RODI water weekly. Just looking for a 'best practice' approach and thinking out loud. Do you see any problem putting Fe gluc and Ca gluc into a dosing solution long term (months)?