But you still have to get the microorganisms from somewhere first ? Either someone else's filter or wait 6-8 weeks for them grow naturally.The fulvic acids contained in this substrate help create an optimal environment for plants, animals and microorganisms from day one.
It is just bog standard enriched substrate, which as it says is a great start for plants (and animals ???) and microorganisms. It does not supply the microorganisms (or plants) that is your job.