I dont know if I'd buy this stuff again. I go through a lot of Alkalinity buffer powder and calcium too. I'll be going the liquid route when I'm done with my batch. Magnesium seems worth it. I also noticed that if you follow the A,B,C & D directions, adding x as per x amount of calcium depleted and replaced, the colors seem deeper. That could also be good husbandry since I have been paying closer attention because of the fact I bought all this stuff. I think I wont know untill I go back to the regular 2 part solution.I just got the system how do you like it are you just adding or are testing before