I have used both NaOH and KOH. NaOH seemed to have only Slightly better conversion. The resulting bio was also a little more redish. The Glycerin from using KOH is also much easier to work with, believe me. I use Magnesol for dry-wash. there are lots of pictures of processors and info on this forum along with people willing to answer questions. Make sure and do your research and have a source of oil and a place to get rid of your glycerin.