i'm looking on greg watson's site right now and i see the PMDD...the one that has all the fertilizers you need pre-mixed into one tub (minus iron). i noticed it says one part this, one part that...does anyone know if there are fillers in this or are these numbers 100% pure compounds? how have people's succsss been with greg's products? because is i was thinking that if these chemicals were 100% pure with no fillers, one pound would make a TON of solution.