Mueller PyroPure® pure steam generators produce pyrogen-free steam for system or keg cleaning applications. When condensed, the steam meets U.S. Pharmacopeia (USP) standards for water for injection (WFI) and avoids introducing boiler chemicals into your process. While pure steam and clean steam are used interchangeably in the pharmaceutical industry, not all clean steam generators meet WFI-quality standards. Mueller's pure steam generators use a tangential nozzle to remove impurities from feedwater, ensuring pyrogen-free steam that meets USP WFI requirements.