Oh ok, I was wondering how you ended up using 16-18 cans. How much material did you have to process? I used to run through a couple different tubes so I know how some of the variables correlate. Usually you are only going to get the THC percentage out of the material. So from trim I would only expect 10-18 percent yield. The age of the material can alter your finished product too. I ran some old trim for a guy once and it didn't turn out at all, super dark and didn't have a sellable taste.
What kind of system is your grower going for?
RE: Crude Method for Cannabis Extraction