User Review of the Grindenstein Knockbox
One of the most underestimated tool in our home barista arsenal must be a knockbox; however, you do not really know how valuable a knockbox is until you don't have it. It is essentially a very simple design, a bin with a bar across it so you can wack your portafilter to dislodge the spent puck. I have used the Grindenstein knockbox for about two years and I feel like it is time I can give it a little review.
Source: http://www.roaste.com/CoffeeBlogs/sontondaman/User-Review-Grindenstein-Knockbox