Centrifuge filter units for sample volumes of no more than 0.5 or 2.0 ml. Filter unit and collector tube are made of PP.Open the attached lid of the filter unit Fill the insert with the volume of sampleClose the filtration unit and insert it in the centrifugeOn completion of centrifuging, remove the filtration unit, open the lid and remove the insertThe insert contains the residue and the sealable housing contains the filtrate