3M PURIFICATION
AIR LIQUIDE
Air Products and Chemicals Inc.
ASAHI KASEI CORP.
DOW Inc.
EVOQUA WATER TECHNOLOGIES CORP.
Honeywell UOP
KOCH MEMBRANE SYSTEMS
KUBOTA CORP.
MICRODYN-NADIR GMBH (SUBSIDIARY OF MANN+HUMMEL)
MILLIPORESIGMA
PALL CORP.
SUEZ SA
TORAY INDUSTRIES Inc.