Hi guys, Last time I made my macronutrient mix (based on the Sears/Conlin approach) I used chemicals that I was able to get via the University chemistry dept. But now I'm no longer at Uni I need to find another source for the suitable chemicals. Any pointers (either for raw chemicals / recipes / premixed) gratefully recieved... (My micronutrient mix, on the other hand, should last me for another 5 years :-)) Cheers, Len.