in my opinion nutrients are nutrients, if you know the biology of the plant your growing then you measure what it needs in n/p/k calcium, magnesium, maganese, sugar, carbohydrates. blah blah blah you get my drift. a name is a name but a chemical is a chemical. as far as the ph perfect thing. lastnight i used the ph perfect in 2 seperate rez with no additives, hmmm for some reason one is reading 5.9 while the other is reading 6.1 so even if my meter is outta whack there is obviously a differential in the two readings which means to me that the solution is not stable. anyone care to comment?