The Thomson Optimum Growth™ Family of products is expanding into downstream processing with a revolutionary new technology that allows high speed clarification of cellular material. The filters work by simply switching the vented Optimum Growth™ Cap to the Rapid Clear® Cap. The only equipment required is a peristaltic pump. In initial testing the units can filter up to 2.5L-3L of high density culture, 6×10^6 -20×10^6 @ >70% viability, in approximately 18 minutes. This technique will transform the time consuming and laborious task of harvesting cells to a rapid walk away procedure.