Very interesting video. I've seen this method before.
Processing with everything below the freezing point of water, minimizes the amount of chlorophyll (and anything else that's water soluble) being extracted into the solution. The waxes and the oils are also minimized. Since chlorophyll can cause gastric distress, minimizing this is important to some people (like me).
Right now, I'm primarily interested in making alcohol-based tinctures, so I have to use Everclear (ethanol/grain alcohol). Since it takes at least 10 times as much solvent, by volume, as plant matter, to get a good extraction, evaporating the excess alcohol becomes expensive. I was considering making some sort of macgyver alcohol recovery device, but the water distiller they're using may be a viable solution for me.
Edited by Arisia, 19 June 2011 - 04:50 PM.