I am using the ProMix BX lately because the farmer supply doesn't stock the right compost over the winter. I notice also that in veg, the plants appear more tolerant of wacky pH but in flower, they will show problems more readily. I've started adding CalMag to my watering solution after running an alkalinity profile on my well water and discovering that while it took an unheard-of amount of H2SO4 to drop it to the test range (pH 4.5), the actual alkalinity as measured in mg/L of CaCO3 was only 2.4! meaning I'm running a shitload of orgnic acids- probably tannic considering it's a hemlock forest- through the ProMix. What all this means is that my lime is getting used up super duper fast and I'm supplementing the buffer in the soil with the buffering ability of the CalMag.
Just a little rambling... I'm running on like 4 hours of sleep... :drool: