first off there link.
www.gettankedaquariums.com As most know I and Vishnu were getting our salt and suppliments from Garry at GTA, to try and go to a cheaper route I switched and have been bouncing back and forth using different salt brands and suppliments and finding I'm not getting the same results that I was when I was using GTA's Organic salt mix and suppliments, and finding Pharmaceutical grade suppliments are striped of many elements corals benifit from to make it compatible for human use, mother Earth feeds our seas with organic elements our government requires guide lines for our health and well being.
I'm hoping Garry will have more time to chime in and explain in more detail and as time goes on I will be posting on my findings more on this forum from other users of there produces.
All I Know is when i was using this Organic salt mix every batch I made I never got different readings and most know the key to this hobby is stability.