| AF Equip. Co. Inc. |
| ATP Mfg. Ltd. |
| A-Certi-Pure Drinking Water Systems |
| Action Mfg. & Supply Inc. |
| Addie Water Sys., Inc. |
| Alan Mfg. |
| Alpine Softener Corp. |
| Applied Membranes, Inc. |
| Aqua Care Sys., Inc. |
| Aqua Man Inc. |
| Aqua Purification Sys. |
| Aqua-Flo, Inc. |
| AquaFlow Pump & Supply Co. |
| AQUAPURA Corp. (The) |
| AQUApura - Tempest Environmental Systems, Inc. |
| Atlantic Filter Corp. |
| B & R Ind. |
| Beacon Water Equip. Co., Inc. |
| Bestech, Inc. |
| Bio-Chem Assoc., Inc. |
| Calgon Carbon Corp. |
| Campbell Mfg. Inc. |
| Canadian Water Cond. Inc. |
| Cartwright Consulting Co. |
| Challenger Water Int'l., Inc. |
| Charger Water Treatment Products, LLC. |
| Clack Corp. |
| Clarity Filters |
| Clean World Waters |
| Cochrane, Inc. |
| CUNO Water Factory Sys. |
| CuZn Water Sys. |
| Dime Water |
| Doulton Water Filters |
| DuPage Water Treat. Prod. |
| Durastill |
| Ebtech Corp. |
| Engineering Specialties |
| Enting Water Cond., Inc. |
| Enviro Systems Corp. |
| Envirogard Prod. Ltd. |
| Environmental Safety Prod. - E.S.P. |
| EPIC Water Sys. |
| Ermco, Inc. |
| Everpure, Inc. |
| FWT Wholesale Inc. |
| F.E. Myers Co. |
| fibredyne inc. |
| Filter Soft |
| Filtercold |
| FilterCor |
| Filtercor, Inc. |
| Flint & Walling, Inc. |
| Flowmatic Sys., Inc. |
| Global Environ. Tech., Inc. |
| Great Lakes Int'l., Inc. |
| H2O Int'l. Inc. |
| Harmsco Filtration Prod. |
| Hellenbrand Water Cond., Inc. |
| Home Water Sales |
| Horner Discus Int'l. Inc. |
| Hudson Corp. of Texas |
| Hurley Chicago Co., Inc. |
| Hydro Systems Int'l., Inc. |
| Hydro-Flow Filtration Sys., Inc. |
| Hydropure Water Treat. Co. |
| Hydrotech, Inc. |
| International Water Werks, Inc. |
| Ionics, Inc. |
| KX Ind., L.P. |
| Katadyn U.S.A., Inc. |
| Keystone Filter Div. |
| Krudico, Inc. |
| Krevco |
| Lancaster Pump |
| Link-O-Matic Co., Inc. |
| Marlo, Inc. |
| Memtec America Corp. |
| Metanoia Int'l. Sales Co. |
| MID AMERICA WATER TREATMENT |
| Mountain Filtration Sys., Inc. |
| N.R.G. Enterprises, Inc. |
| Nelsen Corp. |
| New Age Water Tech. |
| Nu-Calgon |
| Oasis Corp. |
| Omnipure Filter Co. |
| Osmonics |
| Ozone Pure Water Inc. |
| Ozotech, Inc. |
| Porex Tech. |
| Premier Mfg. Sys., Inc. |
| Pro-Flo Prod., Inc. |
| Procam Controls, Inc. |
| PURA, Inc. |
| Pure 1 Sys. |
| Pure Aqua, Inc. |
| Pure Water Source (The) |
| PURITY Corporation (The) |
| Quadel Ind. Inc. |
| RainSoft |
| Reynolds Water Cond. Co. |
| Rosedale Prod. |
| Rustrap Mfg. |
| Safe Water Tech., Inc. |
| SemperPure Sys., Inc. |
| Separmatic Filter Co. |
| SERFILCO, Ltd. |
| Smith & Loveless, Inc. |
| Southeastern Filtration & Equip. Sys. |
| Springsoft Int'l. |
| Sprite Ind., Inc. |
| Sta-Rite Ind. |
| SunRay Tech., Inc. |
| Sunshine Water Cond. |
| TGI Pure |
| Triple O Sys., Inc. |
| Trojan Tech. Inc. |
| United Filters Inc. |
| Valnco Inc. |
| Water Equip. Tech. Inc. |
| Water Services Corp. |
| Water Tec Int'l. |
| Water Tec Tucson |
| WaterCare Corp. |
| Watermark Corp. |
| Western Water Prod., Inc. |
| Western (Water) Purifier Co. |
| Wood Bros. Ind. II |
| World Sector, Inc. |
| Zhou Yuan Int'l. Corp. |