I concur, with the above advice." If not Glycol" may I suggest making only a 100 ml of A. I mix up B, for one use, right before, i develop. I measure out 7.5 grams of carbonate dissolve in water, add my 10 ml of A to THAT, add more water to 1L. valola!!!
See, it only makes sense "to make" as much of A, that you will use in a month or two, not 6 months. I suggest, take the extra time to measure out B, for each instance. Ya, I know I will be in the minority here!! a.k.a. "thats not necessary!! etc. But fresh B is needed.IMO. Carbonate will lose its 'effectiveness" if stored too long