Since I do small amounts. I just go to a local vapor e cig place and buy pure pg/vg blend with no flavors or nicotine. Put some of that in a shot glass. I do a double boil type thing. Take a skillet or pot, put water in it. Then placed a drinking glass with a little water in that, and put the shot glass in the drinking glass. Bring that up to temp with the shot glass containing solvent. I bring to boil and let it stand for 10-15 minutes. Then start adding in hash. Stir and slowly dissolve in, will take about 30min or so. Then you're good to go. That you have to use in a tank, too fluid for the concentrate coils.