Chlorine Testing Equipment
| Action Mfg. & Supply Inc. |
| Applied Membranes, Inc. |
| Aqua Care Sys., Inc. |
| Better Water Ind. Inc. |
| Canadian Water Cond. Inc. |
| Capital Controls Co., Inc. |
| Charger Water Treatment Products, LLC. |
| Deltatrak, Inc. |
| DuPage Water Treat. Prod. |
| Engineering Specialties |
| Environmental Test Sys., Inc. |
| Filter Soft |
| Fluid Sys. & Controls, Inc. |
| GLI Int'l. |
| H F Scientific, Inc. |
| Hach Co. |
| Horner Discus Int'l. Inc. |
| Krevco |
| Lancaster Pump |
| MID AMERICA WATER TREATMENT |
| Nelsen Corp. |
| New Age Water Tech. |
| Orbeco Analytical Sys., Inc. |
| Palintest |
| Pure Aqua, Inc. |
| R.O. Sys. Int'l. |
| Spectrum Labs, Inc. |
| Taylor Tech., Inc. |
| Tintometer Ltd. |
| Tintometer Ltd. |
| Water Equip. Tech. Inc. |
| Water-Right, Inc. |
| Waterite Inc. |
| Western Water Prod., Inc. |
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