Stock is fed tangentially into the inlet portion which along with centrifugal action of specially designed rotor is forced downward. The heavier impurities such as glass, pins, sand particles settles down in separate dirt vessel provided with two numbers of pneumatically operated pulp valves with auto control panel for auto purging. The reject time has to be adjusted according to the impurities present in the furnish and the time taken for filling the dirt vessel. Elutriation Water is fed into the two nozzles provided in the dirt vessel for minimizing fibre loss. The high density cleaner cleans pulp, fibres and all kind of stock suspension at consistencies up to 4%.