The RenaPure endotoxin-retentive cartridge filter is the final filter in hemodialysis water treatment systems to remove any remaining bacteria, endotoxin and particulate matter from the water. Cleared by the FDA as a 510(k) Class II medical device for hemodialysis water treatment systems, the RenaPure filter features a positively charged pleated polyethersulfone membrane filter that removes negatively charged biological impurities such as endotoxins.