ErtelAlsop manufactures depth filter media and liquid-filtration machinery, a business rooted in Ertel Engineering, founded by Frederick Ertel in 1932, and Alsop Engineering, founded by Samuel Alsop in 1920. The companies merged to form ErtelAlsop, which developed from filter media for pharmaceutical use into filtration equipment and media for liquid processing. The Kingston, New York company says customers have bought from it for over 80 years.
Falls Filtration Technologies, IncSince 1927, Falls Filtration Technologies has manufactured air and liquid filtration products, building a distinctive history around oil bath filters and aerospace filtration. The Stow company pioneered an oil filter that achieved a perfect bearing test on aircraft engines, and one of its early Unimaze air-intake filters flew aboard the Spirit of St. Louis. Today, Falls designs filtration solutions for equipment ranging from engines and compressors to aircraft and locomotives, serving customers through distributors across the United States and Canada.STOW, OH
Steri TechnologiesFounded in 1988, Steri Technologies designs and manufactures USA-made filtration equipment and systems for demanding liquid-solid separation, with particular depth in chemical and pharmaceutical applications. Its FUNDA, ZWAG and CANDLE systems have been installed at hundreds of locations worldwide, while in-house engineering, ASME pressure-vessel fabrication and lab testing support highly customized installations. Steri also keeps U.S.-based spare parts and rental equipment available for short-term needs and ongoing service.BOHEMIA, NY
Knight CorporationFor more than 50 years, Knight Corporation has made liquid-filtration equipment, including filter bags and the housings that hold them. Based in Philadelphia with a Houston office, the company pairs stock products with custom filter-bag designs and application support for demanding industrial processes. Its multi-bag housings can accommodate up to 23 baskets and are available with ASME code stamps.333310HAVERTOWN, PA
Towner FiltrationKnown as “The Filter People,” Towner Filtration has served industrial customers since 1953. Its Twinsburg team helps manufacturers and other heavy-industry operations solve filtration problems, including through custom filter media designed to extend service life and improve process quality.TWINSBURG, OH