Perlmutter Unfiltered, www.perlmutterunfiltered.com, is a blog by Barry A. Perlmutter regarding solid-liquid separation. 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. 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.