Increase filtration efficiency. Thermo Scientific; Nalgene™ Nalgene; Nalgene™ Rapid-Flow; Nalgene™ disposable Filter Units feature the exclusive Rapid-Flow support column design, providing fast flow rates and high throughput. The last line of defense against cell culture contamination—Nalgene Rapid Flow Filter Units and Bottle Tops are the best choice for the filtration of cell culture media, serum, additives and buffers. Some products on this page are ACT Labeled by My Green Lab to enable data-based sustainable product purchasing decisions (see "Full Specifications" in the product table for item participation).