Our History


Revolving algal biofilm (RAB) is invented at Iowa State University


Patent for the algal biofilm system is submitted in March


Dr. Martin Gross and Dr. Zhiyou Wen found Gross-Wen Technologies


Dr. Darren Jarboe joins the company as VP of Business Development

The City of Chicago (MWRD) starts a pilot program to evaluate the potential for the RAB system to treat wastewater at a large municipality


Gross-Wen Technologies wins its first Phase I USDA Small Business Innovation Research grant

Dave Furbush invests in GWT as an angel investor

An onsite, pilot-scale test is implemented in the City of Dallas Center, Iowa

Ag Startup Engine Inc. invests in GWT


Gross-Wen Technologies wins the second Phase I USDA Small Business Innovation Research grant

Max Gangestad joins GWT as a Process Engineer

GWT wins a Phase 2 USDA Small Business Innovation Research grant

Xuefei Zhao joins GWT as a Research Scientist

Pilot-scale testing begins with the City of Ames, Iowa

GWT wins Pappajohn entrepreneurial competition

GWT installs a commercial pilot with MWRD Chicago


GWT hires Michael Gross as Operations Manager

GWT is issued a utility patent on the RAB treatment system from the USPTO

GWT receives regulatory approval for installing the RAB system in Iowa

GWT begins a commercial pilot with the city of Cresco, Iowa

GWT raises a $2 million investment from Doerfer Industries to deploy RAB technology

We don’t just think green,
we grow it ™
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