HELLO!! I've tried reading about fasa and fasw, and I am confused about what the difference is. Do they do the exact same thing? Like if you have xylene or whatever solvent with dmt in it, you add either fasi or fasw, filter out the fasi or fasw, spice should precipitate out, you pour off the fasw and take your spice? Does fasi and fasw do the same thing, or is one better than the other?