Does the reuse of the Waste Tubes increase the risk of cross-contamination?

No, we were able to prove experimentally that cross-contamination does not occur through the reuse of the Waste Tubes. The Waste Tubes are used to collect the flow-through from the lysis and washing steps, where the flow-through is discarded afterwards. If the flow-through is to be used for further processing, we recommend the use of a Collection Tube.