Blue-White Industries, of Huntington Beach, Calif., obtained an NSF International listing for its Chem-Feed C-1500N metering injectors. In addition, the product is ETL, CSA and CE listed. Used in a variety of water and wastewater chemical treatment applications, it features the company’s exclusive heavy-duty head with cartridge valves constructed of PVDF. Each valve has two ceramic checks, and is double sealed. The double ball valve design provides enhanced priming, and is exceptional for purging air and gas.