Membranes, Ulrafiltration
| Action Mfg. & Supply Inc. |
| Advanced Membrane Tech., Inc. |
| Alpine Softener Corp. |
| American Engineering Svc., Inc. |
| Applied Membranes, Inc. |
| Aqua Man Inc. |
| Aqua-Flo, Inc. |
| AQUApura - Tempest Environmental Systems, Inc. |
| Atlantic Filter Corp. |
| Calco, Ltd. |
| Canadian Water Cond. Inc. |
| Cartwright Consulting Co. |
| Challenger Water Int'l., Inc. |
| Charger Water Treatment Products, LLC. |
| Cochrane, Inc. |
| DuPage Water Treat. Prod. |
| Elga Inc. |
| Environmental Prod. USA, Inc. |
| Fibercor |
| Filter Prod., Separations, & Sys. Inc. |
| Filter Soft |
| Flowmatic Sys., Inc. |
| Global EnviroScience Technologies, Inc. |
| Great Lakes Int'l., Inc. |
| Horner Discus Int'l. Inc. |
| Hudson Corp. of Texas |
| Hydranautics |
| Kinetico Inc., Engineered Sys. Div. |
| Koch Membrane Systems |
| Lancaster Pump |
| Link-O-Matic Co., Inc. |
| Memtec America Corp. |
| New Age Water Tech. |
| Nimbus Water Sys., Inc. |
| Osmonics |
| Osmonics Autotrol |
| Osmonics Desal |
| Osmotik / Osmosis Tech., Inc. |
| Pure Aqua, Inc. |
| Puregen Tech. Inc. |
| R.O. UltraTec USA |
| Safe Water Tech., Inc. |
| Smith & Loveless, Inc. |
| SpinTek Filtration |
| Sunshine Water Cond. |
| TriSep Corp. |
| U.S. Filter |
| Water Equip. Tech. Inc. |
| Water Sciences, Inc. |
| Water Services Corp. |
| Water Tec Int'l. |
| Water Tec Tucson |
| Waterite Inc. |
| Watermark Corp. |
| Western Water Prod., Inc. |
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