CELLTREAT® Vacuum Filter Systems and Bottle Top Filters are ideal for large volume sample separation and purification. The filter units are manufactured in a Class 100,000 clean room, from USP class VI virgin polystyrene. The filter membrane is Polyethersulfone (PES) material in 0.22µm or 0.45µm pore sizes for rapid flow rate and low protein binding. Bottle top filters are compatible with 45mm neck bottles. The filter units are sterile (gamma irradiated) and available in 150ml, 250ml,500ml and 1000ml sizes and are individually packaged in easy to open plastic bags with individually wrapped caps.