Hi Butcherman,
I warned you not to go there!!!!
I started to enquire a few years back about water changes and maintaining the elements in our tanks by means of salts mixed with RO water, as an alternative to using sea water! Maintaining and replenishing these elements, taking out the nasty stuff and getting the good stuff back in (via water changes), even back them and I still stick to my guns
regarding what I said then!
We think that we need to spend all this cash on the most expensve salts on the market, when actually none of them, even come remotely close to replicating NSW. There are few other research documents floating around the web along with this one that Dallas has posted! Go and do some research and come to your own conclusions about this!