1. 3M Company
2. Aquatech International LLC
3. Culligan International Company
4. DuPont de Nemours Inc.
5. Ecolab Inc.
6. Evoqua Water Technologies LLC
7. Filtra-Systems Company LLC by Chickasaw Nation Industries Inc.
8. General Electric Company
9. J Mark Systems Inc.
10. Kuraray Co. Ltd.
11. Lamor Corporation Plc
12. Lenntech B.V.
13. Robert B. Hill Co.
14. Samco Technologies Inc.
15. Xylem Inc.