like i said in another post the two waters have no effect on the potency of the gh. the difference is that bacteriostatic water limits the growth of bacteria in you solution as it has 0.9% benzyl alcohol added to it, whereas regular sterile water does not, therefore allowing free bacteria to grow with little to no restrictions. Cold temperature has a bacteriostatic effect as well, not quite as good as benzyl alcohol thus the reasoning for max 3 days if sterile water is refridgerated. BAC water would safely be useful for a month or so.