I don't use additives either, but the owner of my LFS who is a marine biologist that's worked all over the place said that it was new and that he heard great things about it and wanted me to give it a try so i got it. You aren't supposed to need to test because there is such tiny traces in the stuff and it is for use every day. They do not give a list of ingredients, its one of the companies things that they don't want everyone to know what they are using in their products. Its one capfull for every 50g of water every day, i used there Fish solution in my FO tank for about a year and my fish were very healthy and brightly colored so i figured i would give the reef stuff a go. It is mostly vitamins and not so much elements although they r in there. There is also some type of garlic in it because you can smell it.