This method seems to work great, the idea of no chemicals is always good. If your useing properly stored trim, & hand paddling wrather than using elec tools.. allow time for trichomes to fall to the bottom, (foilage will float to top). Once extracted from the bag, put into clear glass with icewater and rinse, again the impurities will float to the top, spoon out top layers of impurities and repeat 2 or 3 times. This method produces some of the purest peanut butter hash I have ever smoked.
