The Minisart® syringe filters are the easy choice for sterile filtration in the lab. Offering low absorption characteristics, high flow rate and reliability. Filtration of 50 mL Samples in a Few Seconds The Right Product for Care-Free Filtration of Small Volumes Sartolab ® RF 50 vacuum filtration units are single-use units designed for the filtration of sample volumes of up to 50 mL.