| Advantec Toyo Kaisha, Ltd. |
NGK FILTECH,LTD. |
| Alfa Laval K. K. |
NIHON FILTER CO., LTD. |
| Any Engineering Co.,Ltd |
NIHON MILLIPORE LTD. |
| AQUAS Corporation |
Nihon Pall Ltd. |
| ARAI MACHINERY CORPORATION |
NIHON ROSUIKI KOGYO CO.,LTD. |
| ASAHI FIBER INDUSTRY CO.,LTD |
Nihonkaisui Co., Ltd. |
| ASAHI KASEI CORPORATION |
NIKUNI co.Ltd |
| Azumi Filter Paper Co.,Ltd. |
Nippon Denko Co.,Ltd |
| Chisso Filter Co., Ltd |
NIPPON REFINE Corporation |
| CUNO K.K. |
NIPPON RENSUI CO. |
| Daiwabo Co., Ltd |
Nippon seisen Co.,Ltd. |
| Degremont S.A. |
Nishiyama Corporation |
| EarthProtect Co.,Ltd. |
NISSO ENGINEERING CO.,LTD |
| Endress + Hauser Japan Co., Ltd. |
NITTO DENKO MATEX CORP. |
| ERC, Inc. |
Nomura Micro Science Co., Ltd. |
| FUJI FILTER MGF.CO.,LTD. |
Noritake Co.,Limited |
| Georg Fischer Ltd. |
Ogawa Environmental Reseach Institute |
| Hitachi Plant Engineering & Construction Co., Ltd. |
Okamoto pump |
| HYMO Co.,Ltd. |
OKAWARA MFG. CO., LTD. |
| ISHIGAKI COMPANY, LTD. |
ORGANO CORPORATION |
| KAMATA BIO ENGINEERING |
Osaka Sanitary Metal Industries Cooperative Union |
| KANAGAWA KIKI KOGYO CO., LTD. |
RION Co., Ltd. |
| Kankyokogaku inc. |
ROKITECHNO Co,.Ltd. |
| KANSAI WIRE NETTING CO.,LTD |
SAITO SEPARATOR LIMITED. |
| KINSEI SEISHI CO.,LDT. |
SEISHIN ENTERPRISE CO.,LTD. |
| KITZ Corporation |
SHINRYO AQUAIR Corporation. |
| Koei Sangyo Co., Ltd. |
Showa Chemical Industry Co.,Ltd. |
| Kubota Corporation |
Sonac Inc. |
| Kuraray Co., Ltd. |
Suido Kiko Kaisha,LTD. |
| KURITA MACHINERY MFG. CO., LTD. |
Sumitomo Heavy Industries,Ltd |
| Kurita Water Industries Ltd. |
Tohkemy Corporation |
| Kyowa Exeo Corporation |
Tohzai Chemical Industry Co.,LTD. |
| Kyowa Kako Co., Ltd. |
TOKIWA CO.,LTD. |
| MAKINO CORPORATION |
TOMOE Engineering Co., Ltd. |
| MANABE KOGYO CO., LTD. |
Toray Industries, Inc. |
| Meltex Inc. |
TOYO SCREEN KOGYO CO., LTD. |
| Mitsubishi Rayon Engineering Co., Ltd. |
TRITEC CORPORATION |
| MIURA CHEMICAL EQUIPMENT CO.,LTD. |
WELLTHY CORPORATION |
| Morinaga Engineering Co.,Ltd. |
YAMASHIN-FILTER CORP. |
| Nagase & Co., Ltd. |
|