They make a lot of different products some of which do have soil. ProMix HP is the one I've used for about 15 years and has no soil or nutrients in it. With RO water and AN pH Perfect 3-part nutes I can use it straight out of the bale and just soak it down with a nute mix and it's ready to go. Never have to worry about pH so it's a real time saver.
Their Veg and Herb mix grows nice plants all on it's own and has some soil along with organic time release nutes in it but need some perlite added to improve drainage.
You should check out their training centre for lots of great and science based plant info.
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