Pall provides seperation and purification of liquids and gases using specialised polymeric membranes. Pall is a materials science and engineering company with a large in-house library of proprietary membranes that can be modified or treated to separate, selectively capture or remove even the most frustratingly elusive contaminants. .Smart. filters that stop specific contaminants, yet allow desirable fluid components of equal size to pass through, illustrate the complexity of what we do.