| Symbol | Name | Country | Exchange |
|---|---|---|---|
| ECL | Ecolab Inc. | US | NYSE |
| LIQT | LiqTech International, Inc. | US | NASDAQ |
| NEPH | Nephros, Inc. | US | NASDAQ |
| ERG | Eneco Refresh Limited | AU | ASX |
| REH | Reece Ltd | AU | ASX |
| WAT | Waterco Limited | AU | ASX |
| PURA | Puration Inc | US | OTC |
| SYEV | Seychelle Environmtl | US | OTC |
| UMHL | Umatrin Holding Limited | US | OTC |
| 256150 | Handok Clean Tech Co. Ltd | KR | KQ |
| AMD | Amiad Water Systems Ltd | IL | TA |
| 4556 | Bright Sheland International Co Ltd | TW | TWO |