for Macro molecular range (viruses)
Ultrafiltration is a membrane separation technique in which very fine particles or other suspended matters, with a particle size in the range of 0.005 to 0.1 microns, are separated from a liquid. It is capable of removing salts, proteins and other impurities within its range. This range is able to filter out very fine particulate matter, bacteria and other micro- organisms. It will also take care of a broad range of viruses. Due to increased pore size and lower drive force pressure on membrane however it is not possible to separate dissolved substances, unless they are adsorbed or coagulated.