Perlmutter Unfiltered is a blog by Barry A. Perlmutter regarding liquid-solid filtration. Barry is currently President and Managing Director of BHS-Sonthofen Inc., a subsidiary of BHS-Sonthofen GmbH. BHS is a manufacturer of filtration, washing, and drying technologies as well as mixing and recycling technologies. Barry has over 30 years of technical engineering and business marketing experience in the field of solid-liquid separation including filtration, centrifugation, and process drying. He has published and lectured extensively worldwide on the theory and applications for the chemical, pharmaceutical, and energy/environmental industries and has been responsible for introducing many European companies and technologies into the US marketplace. He also works with the American Filtration and Separations Society (AFS) offering input into their blog postings.