TSR Corp.
Providers of sewer cleaning, coating service, video inspection, no dig repair, manholes, catch basins, storm lines, digesters, wet wells.
http://www.thomasregional.com/pnw/tsr/

Tristar Industries, Ltd
Pulp and paper heavy equipment manufacturer, repairing, remanufacturing, rebuilding Pulp equipment, Digesters, Rolls, Pumps, Washer Drums, Fans, Refiners, and Replacement Parts for the Pulp & Paper industry, Cement, Mining, Petrochemical and Gas
http://tristarind.com/

GBU mbH Biogas and Environmental Technologies
Specializing in turnkey bio-gas plants and environmental technologies including hydraulic mixing anaerobic digesters, adsorption chillers and vacuum cascade evaporators.
http://www.gbunet.de

Biomixer
Engineers and fabricates unique wastewater aeration and mixing control systems for non-traditional fine-bubble aeration wastewater applications such as aerobic digesters, oxidation ditches, EQ basins and sludge holding basins.
http://www.netwest1.com/biomixer/