Hi There,
I’ve not personally heard of the fertiliser range you mention, basically as long as it stays in solution in the water you should be fine…. Don’t over concern yourself with the water people from all over the world use all kinds of water. Ec levels seem what most people tend to set at. Pop onto http://www.autopot.co.uk to see the videos and the catalogue…. there is also a very helpful forum on Facebook called the AutoPot Users Group…. join this too as they chaps there are very helpful too