The 1 part Epsom aka mag/sulfur is mainly to make sure the plants getting enough magnesium, the part A has both mag and sulfur in it already so i just run 3 2 1 I veg if the plants need the mag if not I'll run 3 2 at 2.2 ec vs 2 ec with the 321, in flower I cut the Epsom and go to the 4 2 ratio also at 2.2 ec upping the ec a few tics gets them plenty of P K S and Mag via the part A, been following greengenes for a long time and running jacks for about 2 years now with great results, grab it by the 25lb bag if possible it's getting expensive to where athena is a close second choice with a tad more tune ability
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