Cytiva's Whatman Anotop Plus sterile syringe filter with glass microfiber prefilter is compatible with most organic and aqueous solutions for use in a wide variety of applications. Contains an inorganic Anopore membrane and is available in three pore sizes Polypropylene syringe filters comes in two diameters depending on sample volume Integrated glass microfiber prefilter aids in filtration of difficult samples Recyclable after use. Learn how you can recycle it. Non-sterile Whatman Anotop Plus syringe filters are also available from Cytiva's business. Anotop Plus Anotop Plus filters are manufactured with an Anopore membrane suitable for many applications, including capillary electrophoresis, UV/Vis sample preparation, protein separation, and HPLC sample preparation.