The Contaminant Barrier starts with the most trusted filter-drier in the industry – the molded core Catch-All. The Catch-All is the key component in protecting your air conditioning or refrigeration system. The Catch-All’s special blend of desiccants is designed to remove acid, sludge, varnish and wax. And, for further protection against contaminants use Sporlan Suction Filters with exclusive bi-directional flow feature.