Buyer's Guide
| Company | Location | Company Type |
|---|---|---|
| CSI (Chandler Systems Inc.) | Ashland | Manufacturer |
| CSI Water Treatment Systems | Ashland, Ohio, United States | Manufacturer |
| CTL Scientific Supply Corp | Deer Park | Manufacturer |
| CuZn Water Systems | Fayetteville | Manufacturer |
| Cynortic Ltd. | Tauranga | Manufacturer |
| Dakota Instruments | Orangeburg | Manufacturer |
| Dallas Specialty & Mfg. Co. | Grand Prairie | Manufacturer |
| Danamark WaterCare | Brampton | Manufacturer |
| Dataman Group Direct Mail & Telemarketing Lists | Boca Raton | Manufacturer |
| DesignedWise Products, Inc. | West Chicago | Manufacturer |
| Diffuser Express | Columbia | Manufacturer |
| DiscoverTesting.com | Monrovia, California, United States | Manufacturer |
| DistaView Corporation | Bowling Green | Manufacturer |
| Dixie Tank Company | Jacksonville | Manufacturer |
| Dow Chemical Company (The) | Midland | Manufacturer |
| Dow Water & Process Solutions | Edina | Manufacturer |
| Duoline Technologies | Gilmer | Manufacturer |
| Dupage Technology Group, Inc. | Lisle | Manufacturer |
| DuPage Water Conditioning | West Chicago | Manufacturer |
| Durastill | Kansas City | Manufacturer |
| Dwyer Instruments Inc. | Michigan City | Manufacturer |
| Dynaflow, Inc. | Jessup | Manufacturer |
| Eagle Microsystems, Inc. | Pottstown | Manufacturer |
| Eco Sensors, Inc. | Santa Fe | Manufacturer |
| Eco-Tech, Inc. | Signal Hill, | Manufacturer |
