| Addie Water Sys., Inc. |
| Advanced Membrane Tech., Inc. |
| Alan Mfg. |
| Alpine Softener Corp. |
| Applied Membranes, Inc. |
| Aqua Care Sys., Inc. |
| Aqua-Flo, Inc. |
| AQUAPURA Corp. (The) |
| AQUApura - Tempest Environmental Systems, Inc. |
| Atlantic Filter Corp. |
| Beacon Water Equip. Co., Inc. |
| Canadian Water Cond. Inc. |
| Cartwright Consulting Co. |
| Challenger Water Int'l., Inc. |
| Charger Water Treatment Products, LLC. |
| Dime Water |
| DuPage Water Treat. Prod. |
| Durastill |
| Elga Inc. |
| Engineering Specialties |
| Enting Water Cond., Inc. |
| Environmental Prod. USA, Inc. |
| Environmental Safety Prod. - E.S.P. |
| Ermco, Inc. |
| Filter Soft |
| Great Lakes Int'l., Inc. |
| Hellenbrand Water Cond., Inc. |
| Horner Discus Int'l. Inc. |
| Hurley Chicago Co., Inc. |
| International Water Werks, Inc. |
| Ion Exchange Tech. |
| Ionics, Inc. |
| Krudico, Inc. |
| Lancaster Pump |
| Link-O-Matic Co., Inc. |
| Marlo, Inc. |
| MID AMERICA WATER TREATMENT |
| New Age Water Tech. |
| Osmonics |
| Ozone Pure Water Inc. |
| Pro-Flo Prod., Inc. |
| Pure Aqua, Inc. |
| Pure Water Source (The) |
| PURITY Corporation (The) |
| Refinite Water Cond. Co. |
| Resintech Inc. |
| Reynolds Water Cond. Co. |
| Safe Water Tech., Inc. |
| Smith & Loveless, Inc. |
| Springsoft Int'l. |
| Sunshine Water Cond. |
| Water Group Sys., Inc. |
| Water Services Corp. |
| Water Tec Int'l. |
| Water Tec Tucson |
| WaterCare Corp. |
| Watermark Corp. |
| Waterwise Inc. |
| Western Water Prod., Inc. |
| Wood Bros. Ind. II |