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Centrisart I Centrifugal Ultra Filter (100,000 MWCO, Polyethersulfone Membrane, 12 per pack) Centrisart® I ultrafiltration concentrators are disposable devices for biological samples. Centrisart® I is suitable for sample volumes up to 2.5 ml. The unique design allows ultrafiltration to take place in the opposite direction to the centrifugal force. This minimizes membrane blockage even with whole blood or cell lysate samples. The filtrate is collected in the floater insert tube where it is easily withdrawn.