GrowGnome
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I agree with propagating your own mixture hands down, but I think there's one thing to consider about microbe populations. I've read that the effectiveness of microbial mixes is partly in the CFU ratios. My question is this; if I were to culture my own microbes from a batch of Mammoth-P, what would happen to those populations? I imagine one of the species would dominate and the solution might not be as effective over a long period of continued culturing. You might have to culture a new batch each grow. Do they list the species variety on the label? It would be fun to figure out the ratios and grow them individually and then add them back together, but by that point you've some how found out Mammoth-Proprietary info.