the bowl itself collects the trics ,then when it gets nice and dirty you take a heating gun on the outside of it for a couple of seconds and scrape the inside of the bowl ,last time I did it I got a couple of marbles. I would go out and buy the same one if mine broke , During the summer I grow 60 plants outside so I needed it for that but now that I have one I love it ,It takes me about 15 minutes a ounce dry weight ,I process it wet so a 2 ounce plant takes 1/2 hour . I know odd way of figuring lol