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High-density cleaners are specifically designed to remove high and medium-density contaminants or contaminants with high and medium specific gravities from stock. Contaminants such as rocks, nuts, bolts, nails, paperclips, staples, glass, and other heavy debris are removed by the cleaner. High-density cleaners are not designed to remove wax or other low-density or low specific gravity materials. The stock suspension is pumped tangentially into the top of the cylindrical cleaner body at relatively high velocity. As the stock flows inward, centrifugal force and fluid sheer create a vortex near the center of the cleaner. Dense materials move to the outside wall and drop down into a bottom rejects collection chamber. The fibers migrate to the center vortex and travel upwards to the accepted stock outlet.