| Action Mfg. & Supply Inc. |
| Advanced Membrane Tech., Inc. |
| Alan Mfg. |
| Applied Membranes, Inc. |
| Aqua Care Sys., Inc. |
| Aqua Man Inc. |
| AQUApura - Tempest Environmental Systems, Inc. |
| Atlantic Filter Corp. |
| Beacon Water Equip. Co., Inc. |
| Bio-Chem Assoc., Inc. |
| Braswell Water Quality Sys., Inc. |
| Campbell Mfg. Inc. |
| Canadian Water Cond. Inc. |
| Challenger Water Int'l., Inc. |
| Charger Water Treatment Products, LLC. |
| Clack Corp. |
| Clarity Filters |
| CuZn Water Sys. |
| DuPage Water Treat. Prod. |
| Durastill |
| Ebtech Corp. |
| Engelhard Corp. |
| Engineering Specialties |
| Enting Water Cond., Inc. |
| Environmental Safety Prod. (E.S.P.) |
| FWT Wholesale Inc. |
| fibredyne inc. |
| Filter Soft |
| Filtercold |
| Flowmatic Sys., Inc. |
| Global Environ. Tech., Inc. |
| Global EnviroScience Technologies, Inc. |
| H2O Int'l. Inc. |
| Harmsco Filtration Prod. |
| Hurley Chicago Co., Inc. |
| Hydro Systems Int'l., Inc. |
| Hydropure Water Treat. Co. |
| International Water Werks, Inc. |
| Ionics, Inc. |
| KDF Fluid Treat., Inc. |
| KX Ind., L.P. |
| Krevco |
| Lancaster Pump |
| Link-O-Matic Co., Inc. |
| MID AMERICA WATER TREATMENT |
| N.R.G. Enterprises, Inc. |
| New Age Water Tech. |
| Omnipure Filter Co. |
| Ozone Pure Water Inc. |
| Pro-Flo Prod., Inc. |
| Pure Water Source (The) |
| Puregen Tech. Inc. |
| Reynolds Water Cond. Co. |
| Safe Water Tech., Inc. |
| SERFILCO, Ltd. |
| Smith & Loveless, Inc. |
| Springsoft Int'l. |
| Sprite Ind., Inc. |
| Sta-Rite Ind. |
| Valnco Inc. |
| Water Tec Int'l. |
| Water Tec Tucson |
| Water-Right, Inc. |
| WaterCare Corp. |
| Waterite Inc. |
| Watermark Corp. |
| Waterwise Inc. |
| Western Water Prod., Inc. |
| Western (Water) Purifier Co. |
| Wood Bros. Ind. II |