what would be your ideal trace mix ??
I guess were only looking for levels of Fe, B, Mn, Zn, Cu, Mo.
S and Cl will already be enough in the water as SO4- (K2SO4) and Cl- (KCl), so I don't think they are needed in a trace mix.
Ca and Mg are an other issue. They are often in the tap water, but differs strongly from egion to region, so no Ca or Mg in a trace needen.
What do you think of this (Fe as reference =1)
Fe=1.00 / B=1.00 / Mn=0.50 / Zn=0.15 / Cu=0.05 / Mo=0.005
Do you think specifiek plants / plant families do need a particular element much more ?? (red plants for instance)
English isn't my native language, but I guess you already noticed that :-)