I have had a negative experience! Dosing A4R and ICP came back with low Magnesium, Boron and ZERO Iodine and Molybdenum. I also use TM pro salt and when testing new batches of water, Alk was always 6.4-6.5 (Salifert). Here I was wondering why is my Alk always a little below 7 ?! BTW, I have the German batch. Now dosing kalkwasser and Sodium bicarbonate (NaHCO3) slowly and my Alk is above 7. Also, every time I changed water and/or dosed A4R, some corals were reacting/closing up. Sorry to say, but I am going back to my "old" salt, I've been using TM pro for over a year and a half and did not see any benefits over my previously used salt......except that I needed additional dosing for Alk......