All I really know is one time I used soil from the store for another place I take care of and nats were everywhere by the 3 week. I don't use soil for any of my personal grows but most everyone else I help grow have started with soil too. The one and only time I did not bake it he had nats and they are a bitch to kill and keep dead...the little fuckers....anyway I asume you could be right. I could try it next time and see.

My thought was it's 60 perlite 40% dirt and I controlled the Ph and nutrients from day one and nothing I don't the plant to have get's in. That's the thought anyway.

I do use Dr. Hornby's Piranha in my hydro and some of them use it with their soil too. It's purpose is to add beneficial fungi, ectomycorrhizal and endomycorrizhal fungi. I just think that's the best they can get and all they need.