Established in 1889, the Roberts Filter Group of companies specializes in providing services for the water and wastewater industry. Located in Darby, Pa., the Roberts Filter Group is a family of companies, each designed specifically to serve individual needs throughout the United States and beyond. It offers a wide array of products and services, including pressure filters, GAC (global assembly cache) systems, gravity/package filtration, residuals, pretreatment, instrumentation and control. Services offered include pilot testing, raw water analysis, plant/filter inspections, plant optimization/rehabilitation and turnkey operations.