I started with 1/2 cup to 2/3rds of a cup, depending. But now I'm down to 2 heaping (and I do mean heaping) tablespoons per 2 cups of water. That's one "session" for me. So now that I've kind of hit my sweet spot, I find I don't need quite as much as before. I've also gotten MUCH better at getting all of the oilyness out of the root wad too. I'm a master kneader. I knead for 15 minutes all told, with a very small wetting second wash and third wash, usually.