74064534
May 31, 1990
Apr 7, 1992
two stage water treatment systems comprising coarse media prefilters, fine media polishing filters, pumps, chemical feeders and controls sold as a unit for industrial and municipal water purification, membrane water treatment systems comprising prefilters, pumps, semipermeable membrane separation units, membrane cleaning skids and controls sold as a unit for industrial and municipal water purification, water filtration systems comprising granular or synthetic media which is biologically active, media underdrains and disinfection units sold as a unit for industrial and municipal water purification, dual flow water treatment systems comprising coarse media prefilters, fine media polishing filters, pumps, chemcial feeders and controls sold as a unit for industrial and municipal water purification, water clarification systems comprising coarse media prefilters, fine media polishing filters, pumps, chemcial feeders and controls sold as a unit for industrial and municipal water purification
Environmental Control Apparatus