About Us

Environmental Solutions with Pure Oxygen

ECO2 is a cleantech company headquartered in Indianapolis, providing custom engineered dissolved gas systems for water and wastewater. 

ECO2’s Speece Cone technology is the pioneering effort of Dr. Richard E. Speece.

Speece Cone Installation Columbia Theta Midpoint
Photo: Speece Cone Installation, Columbia, TN

Founded in 2001, ECO2 has built a reputation of providing environmentally friendly alternatives to traditional chemical treatment systems. Initially focusing on odor and corrosion prevention, ECO2 has helped cities across the country solve their needs in both municipal and industrial applications. Simultaneously, ECO2 continues Dr. Speece’s work of improving water quality through Superoxygenation in the nation’s rivers, lakes and reservoirs.


Our vision is to become the worldwide leader in the implementation of innovative pure oxygen transfer technology for water quality improvement.

Alex D. Oak, PE, Founder, Eco Oxygen Technologies, LLC

Meet the Team

David Clidence - President

David Clidence, P.E.

317.706.6482  |  Mobile: 317.997.6428

Mr. Clidence has been a key member of the technical development team since 2000, when the company demonstrated its first force main prototype. His experience includes working with plant operators, consulting engineers, government agencies, component suppliers and construction subcontractors to design, produce and install ECO2 Superoxygenation systems to meet owner performance expectations.

In addition, David supports sales, marketing and promotional programs through presentations to prospects and professional conferences. He was recently elected by peers to the Air Quality Committee of the Water Environment Federation, the national trade organization for water quality professionals. Mr. Clidence holds a B.S. degree in Civil / Environmental Engineering from Purdue University.

Ali Trollier - VP

Alison (Ali) Trollier, P.E.

Vice President of Sales & Marketing
Mobile: 727.434.6473

Ms. Trollier is a passionate and dedicated environmental engineer, with over 15 years in the water and wastewater industry.  She obtained a B.S. degree in Mechanical Engineering in 2003 from the University of Wyoming, and her P.E. license for Environmental Engineering, in the state of Florida, in 2021.

Ali has an in-depth knowledge of municipal, environmental, and industrial water systems through her past experience with Severn Trent Services, Nalco Chemical, Mazzei Injector Company, and Hach Company.

Since her start with ECO2 in November 2016, Ali continues to bring her background in water chemistry and mass transfer systems to help solve problems with an environmentally friendly solution.

Ryan Grimes

Ryan Grimes

Western Regional Sales Manager
Mobile: 214.724.3127

Mr. Grimes joined the ECO2 team in January 2018 bringing 7 years of sales experience in the water, wastewater, and environmental industries for DS Waters of America, Schlumberger, and OMI Industries. While with OMI, he spent 3 years as an odor control specialist managing domestic sales for eastern U.S.

In addition to his knowledge in odor abatement, he brings expertise in customizing solutions for many industrial applications including the industrial and municipal wastewater treatment, pulp and paper processing, food processing, solid waste and manufacturing segments. Mr. Grimes is based in Dallas, TX and is involved with the Water Environment Federation (WEF) and the Water Environment Association of Texas (WEAT).

Garret Schleis

Garret Schleis

Engineering Manager
Mobile: 715.651.6653

Mr. Schleis joined ECO2 in July of 2021, bringing his mid-west work ethic and experience in wastewater aeration systems to the team. Garret has a B.S. degree in Chemical Engineering from the University of Minnesota, Duluth.

In his previous role, he served as an applications engineer for Aeration Industries where he quickly became a team leader, taking on project management, estimating, and engineering roles.

Garret has a wide range of technical skills including systems design, CAD and 3D modeling, project management, organization, and development of Standard Operating Procedures.  Garret is a incredible asset for the growing technical team at ECO2.

Holly Lee

Holly Lee

Client Coordinator | Office Manager
Office: 317.706.6482 | Mobile: 317.442.3955

Ms. Lee worked for ECO2’s sister company, Cripe Architects & Engineers, for 33 years as an Administrative Assistant before joining ECO2 as Office Manager in October 2019. While working at Cripe in 2000, Holly assisted with the initial startup of ECO2, and remains an essential part of ECO2 daily business.

Holly holds an Associate’s Degree in Secretarial Administration from Ball State University.

Eco Oxygen Technologies, LLC

Join Us

Eco Oxygen Technologies is in search of self-motivated, highly qualified individuals who have a desire to succeed and grow within a fast paced and highly technical environment. If you meet the criteria, please submit your resume for review to info@eco2tech.com.  Eco Oxygen Technologies, LLC is an Equal Opportunity Employer.

Board of Directors

Dr. Richard Speece – Inventor, Co-Founder, and Technical Consultant

Dr. Speece is a Professor Emeritus, of Civil and Environmental Engineering, at Vanderbilt University in Nashville, TN, and consultant for ECO2.

Dr. Speece developed and patented the Downflow Bubble-Contactor, which has become known around the world as “The Speece Cone”, for dissolving high levels of oxygen into water.  This technology is the basis for all ECO2 systems.

In addition to his numerous technical publications and innovations in the fields of wastewater treatment and environmental processes, Dr. Speece holds the following degrees:

  • B.S. in Civil Engineering, Fenn University
  • M.S. of Engineering in Civil Engineering, Yale University
  • Ph.D. in Civil Engineering, M.I.T.

Al Oak, P.E.  –  Co-Founder and Chairman

Mr. Oak is also Chairman of Cripe, a large architectural and engineering firm based in Indianapolis, IN.  He has been involved with the firm for over 40 years, and has served as the majority owner, President and CEO for 24 years.  During Mr. Oak’s tenure, the Company has grown significantly and has received several awards and recognition for its growth potential, progressive management style, best places to work, and design excellence in a green environment.

Mr. Oak holds a B.S. degree in Civil Engineering from Purdue University, a MBA in Real Estate from Indiana University and is a registered Professional Engineer. Mr. Oak is a proud member of the Native American community and is a descendant of the Sault Ste. Marie Tribe in Michigan. He has held numerous leadership positions on both for profit and non-profit boards, has been recognized by the governor of the State of Indiana as a distinguished Hoosier and has received legacy awards from both Purdue and Indiana Universities.

Dr. George Tchobanoglous, Member

Dr. Tchobanoglous is currently Professor Emeritus of Environmental Engineering in the Department of Civil and Environmental Engineering at the University of California at Davis. He received a B.S. degree in civil engineering from the University of the Pacific, a MBA in sanitary engineering from the University of California at Berkeley, and a Ph.D. in environmental engineering from Stanford University.

He is also a registered civil engineer in California. Dr. Tchobanoglous’ principal research interests are in the areas of wastewater treatment, wastewater filtration, UV disinfection, aquatic wastewater management systems, solid waste management, and wastewater management for small systems.

He has authored or coauthored over 350 technical publications, including 12 textbooks and two reference works, including collaboration on the industry standard, Wastewater Engineering: Treatment and Reuse, published by Metcalf & Eddy.

Thomas Dapp, Member

Tom Dapp is owner and Chairman & CEO of Gradex, Inc., an Indianapolis-based heavy-highway company he founded. Gradex, celebrating its 36th year, specializes in grading, excavating and utility construction in the public and private sectors and on residential, commercial and industrial sites. Tom is a graduate professional engineer from the University of Wisconsin where he also obtained his MBA. He is currently Chairman of the Indiana Construction Association and a current Board member of the Greater Indianapolis Chamber of Commerce and is Chairman of the Infrastructure and Environmental Committee as well as serving on the Economic Council and Transportation Committees.

He is a Board member of the Carmel Chamber of Commerce and the Carmel Library Foundation where he served as past President. Tom also is a Director of the Western Golf Association, where he is active in promoting the Evans Scholars Program having been a recipient of that scholarship. Honors include being designated a Distinguished Hoosier by Governor Orr, selected to Who’s Who in Construction, Design & Engineering by the Indiana Business Journal, as well as being chosen as one of the 30 most influential persons in construction in the last 30 years. Tom is a Blue Chip Award recipient and a past Board member. He was recognized as Contractor of the Year in 1999 and is a SIR Award winner.

Russell Wurster, Member

Mr. Wurster is a member of KJS, LLC, which is the largest investor in Eco Oxygen Technologies. He has had a wide variety of owner/manager experiences in construction equipment companies and was a principal owner of Wurster Construction Company, a prominent commercial and industrial contractor in central Indiana. He has also developed some major commercial properties and owns a vast majority of the bowling centers in central Indiana. Mr. Wurster also has had many experiences in financing start-up ventures.