I know you want an answer from Bernard, but these questions could be understood with research and gaining a basic knowledge of UMG Silicon and the different types of of solidification for solar silicon.

After plasma purification (PUREVAP), the liquid silicon is transferred into one of the two known downstream methods of producing solar silicon feedstock via rapid cooling or solar silicon ingots via directional solidification (all that changes is the way you solidify the silicon). One method produces poly crystalline silicon and the other produces multi crystalline silicon.

What would decide which one is whatever the client orders, poly or multi crystalline silicon. MOST likely, once the PUREVAP pilot plant comes online and produces enough silicon, our reactor will start directional solidification directly after PUREVAP plasma purification as this is the most cost effective and efficient way of producing solar grade ingots and industry accepted energy efficiency rates (18%+).

Anyways, still not stopping Bernard from chiming in but thought I'd give you a quicker response =)