1. 3M Company
2. Amazon Filters Ltd.
3. Donaldson Company Inc.
4. Eaton Corporation PLC
5. Filtrox AG
6. General Electric Company
7. Graver Technologies
8. Meissner Filtration Products Inc.
9. Membrane Solutions
10. Merck KGaA
11. Microfilt India
12. Pall Corporation
13. Parker-Hannifin Corporation
14. Repligen Corporation
15. Saint-Gobain Performance Plastics Corporation
16. Sartorius AG