The TOMCO Systems Filter Calculator is an assistant tool for sizing CO2 Polishing Filters. This app will help you understand what size filter will be necessary for your system to ensure you get the best product. As the exclusive U.S. distributor of Sure Purity filters, TOMCO2 Systems is proud to offer Sure Puritys high-quality products that are trusted by some of the biggest names in the industry. Sure Purity manufactures an advanced range of carbon dioxide multi-barrier polishing filters – carbogaurd. These barrier filters offer 12-month maintenance intervals while simultaneously offering the most enhanced protection from Carbonyl Sulphide (COS).