Deflaker mechanically treat the fiber flakes and bundles of fibers in the stock in order that they are broken down into individual fibers in a suspension if possible. This is done for a number of reasons and in a number of positions within the system. It can be installed to reduce remaining flakes after a pulper, in the broke system to reduce flakes going back to the machine from the broke pulpers and can also be used in the final stages of a screening system in a recycled fiber line to treat the concentrated rejects and the flakes contained within it.