I must apologise for yet another question about water, but here it is... I called Affinity water and got a water report for my area. I have everything on it that I need, except there is no mention of magnesium. So when I put all this into the water calculator and left the magnesium box empty, it tells me to add a load of magnesium which I probably don’t want to do? Should I just adjust the other parameters and leave the magnesium out? Or is there a way of working out the amount in my water? (Sure I read somewhere that by subtracting the carbonate from the total hardness, it would tell you what the magnesium content was....this may be nonsense though...) Help!