| Business | Phone |
| C C Day Co 3240 Winnetka Ave N, Minneapolis 55427 | (763) 541-9711 |
| Complete Filtration Resources 3700 E 34th St, Minneapolis 55406 | (612) 728-8907 |
| Northern States Filtration Co 228 Cedar Lake Rd S, Minneapolis 55405 | (612) 377-1100 |
| Ultrapure & Ind Svc Minneapolis 55447 | (763) 559-4116 |