This is an extract from the VICI Cheminert catalog.  It is on gas specifics purifiers and contaminant traps.

Features:

• Speedy ROI – produce better than 99.9999% purity from a 99.995% cylinder
• Provide point-of-use gas purification of helium, hydrogen, methane, nitrogen, carbon dioxide or air
• Reduce gas impurities from high ppm to low ppb levels
• Decrease baseline noise and increase GC/MS sensitivity
• Replace three traps with one purifier