The capsule contains two layers of PES membrane, which is inherently hydrophilic, low in extractables and has excellent flow rates. The membrane also exhibits low protein binding characteristics making it ideal for use with biologically sensitive solutions. The device is supplied pre-sterilized and has a vent to evacuate any air to allow fast filtration. The outlet of the capsule is protected to prevent touch contamination during set-up and has standard hose barb connections. Some capsules available with filling bell for cleanliness assurance during filling. Pre-sterilized polyethersulfone (PES) membrane.