"...why didn't they just use the new formulation VitroGrow from the start?"
They didn't have it. The new formulation is new. They realised that it was possible to add certain substances to make it easier to use & store. The actual active ingredient is the same. However better results may insue, as their is a better & more even mix now.
The new formula is much more attractive as a commercial product because of its ease of use & storage.
At least that's what I understand.
cheers
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