Clean Solutions Group (CSG), the leading provider of environmentally responsible nonwoven filtration media and cleaning products, backed by Branford Castle Partners, LP, a New York City and Florida based private equity firm, today announced the acquisition of HDK Industries. HDK is a leading producer of wire back and self-supporting media for air filtration, liquid filtration and specialty medical materials. The HDK Industries brand will be consolidated into the Fibrix Filtration brand managed by the holding company CSG, led by Keith White, Chief Executive Officer, and JR Baccus, President.