Mitsubishi Chemical Aqua Solutions Co., Ltd.
Japanese water-treatment engineering company providing one-stop solutions from intake water to wastewater, wholly owned by Mitsubishi Chemical Corporation.
Last updated September 27, 2026
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Overview
Mitsubishi Chemical Aqua Solutions Co., Ltd. (MCAS) is a Japanese water-treatment engineering company headquartered in Nihonbashi-Hongokucho, Chuo-ku, Tokyo. It is a wholly owned subsidiary of Mitsubishi Chemical Corporation, part of the Mitsubishi Chemical Group. The company traces its origins to Nihon Rensui Co., Ltd., established in 1952, and over seven decades has developed into a specialist provider of water and separation-purification technologies. Its corporate slogan, "Use water. Connect with water." (水を活かす。水で結ぶ。), reflects a business built around the full water cycle. MCAS offers a one-stop range of water-treatment proposals spanning intake water (上水) through wastewater (排水). Its portfolio covers groundwater and industrial-water potabilization systems, membrane filtration, softening and pretreatment equipment, pure-water and ultrapure-water systems, cartridge water purifiers, wastewater treatment and recycling equipment, water-treatment chemicals, and medical/pharmaceutical water systems. It also operates a separation and purification business, with chromatographic separation equipment such as the ISMB™ improved simulated moving bed system, boron removal and recovery systems, and purification systems for vitamin E, functional food ingredients, pharmaceuticals, amino acids, nucleic acids, sugar solutions, iodine, glycerin, and other products. The company serves a wide range of industries, including chemicals, pharmaceuticals, cosmetics, food, semiconductors, batteries and devices, electric power, machinery and automobiles, and commercial facilities and hospitals. Its groundwater membrane filtration systems have been adopted by hospitals and hotels, and its PFAS removal equipment has been installed at water distribution facilities in Japan. MCAS also works on sustainability-related initiatives, including concentrated bio-liquid fertilizer production and hydrogen energy manufacturing support. Internationally, MCAS has established operations in Singapore (MCC Aqua Solutions Asia Pte. Ltd.), the Philippines (Philippine Branch), and Myanmar (MW Aqua Solutions Co., Ltd.). The company has undergone several name changes reflecting its parent group's evolution: it became a wholly owned subsidiary of Mitsubishi Kasei (later Mitsubishi Chemical) in 1970, became a wholly owned subsidiary of Mitsubishi Rayon in 2010, changed its name to Mitsubishi Rayon Aqua Solutions in 2015, and adopted its current name, Mitsubishi Chemical Aqua Solutions, in 2017. In 2018 it became a wholly owned subsidiary of Mitsubishi Chemical Corporation, and in 2021 it relocated its headquarters to Nihonbashi-Hongokucho.
History
The company's history begins in 1952 with the establishment of Nihon Rensui Co., Ltd. (日本錬水株式会社). In its early years it opened Osaka and Kyushu branch offices (1952) and a Nagoya office (1959), and in 1964 moved its head office to Marunouchi, Chiyoda-ku, Tokyo. In 1970 it became a wholly owned subsidiary of Mitsubishi Kasei Corporation (三菱化成株式会社), the company now known as Mitsubishi Chemical Corporation. A research laboratory was opened in 1971, and Rensui Service Co., Ltd. (株式会社錬水サービス) was established in 1973. Through the 1980s and 1990s the company expanded its service network and technical capabilities. It established a resin regeneration center in 1981, founded Wellthy Co., Ltd. (株式会社ウェルシィ) in 1985, opened Kyushu and Kansai branch offices in 1994, and moved its head office to Minami-Otsuka, Toshima-ku, Tokyo in 1996. That same year it formed a business alliance with Mitsubishi Rayon Co., Ltd. (三菱レイヨン株式会社). In 1997 it established Rensui Asia Pte. Ltd. in Singapore (later MCC Aqua Solutions Asia Pte. Ltd.). In 1998 it registered for ISO 9001 certification and took over chromatographic separation technology from Mitsubishi Chemical Engineering Corporation. It moved its head office to Kayabacho, Chuo-ku, Tokyo in 1999 and merged with Rensui Service Co., Ltd. in 2000. The 2000s brought further certification, expansion, and recognition. In 2002 it registered for ISO 9001 and ISO 14001 and opened the Japan Ecology Research Institute (water quality analysis center). It opened a Chubu branch in 2004, received the Excellence Award at the 3rd Courageous Management Award hosted by the Tokyo Chamber of Commerce and Industry, and opened a Central Research Laboratory in 2005. In 2006 it opened a Hokkaido branch, moved its head office to Kojimachi, Chiyoda-ku, Tokyo, and won the Grand Prize and the Minister of Economy, Trade and Industry Award at the New Business Awards. In 2007 it opened a Tohoku sales office and registered for ISO/IEC 17025 accreditation. In 2010 the company became a wholly owned subsidiary of Mitsubishi Rayon Co., Ltd. In 2012 it opened the Separation and Purification Center and Kurosaki Office, and established Mitsubishi Chemical Aqua Solutions Co., Ltd. Philippine Branch. In 2013 it moved its head office to Hitotsubashi, Chiyoda-ku, Tokyo, registered for ISO 22301, and became a consolidated subsidiary of Mitsubishi Rayon. In 2015 it took over most of Mitsubishi Rayon's water-treatment membrane and equipment sales business, changed its name to Mitsubishi Rayon Aqua Solutions Co., Ltd., and moved its head office to Osaki, Shinagawa-ku, Tokyo. In 2016 it obtained Resilience Certification as a contributor to national land resilience. In 2017 the company changed its name to Mitsubishi Chemical Aqua Solutions Co., Ltd., took over the medical business from Mitsubishi Chemical Cleansui Co., Ltd., and established MW Aqua Solutions Co., Ltd. in Myanmar. In 2018 it became a wholly owned subsidiary of Mitsubishi Chemical Corporation. In 2019 it merged with Wellthy Co., Ltd. and again changed its name to Mitsubishi Chemical Aqua Solutions Co., Ltd. In 2021 it transferred its membrane sales business to Mitsubishi Chemical Corporation, took over the plant factory business from Mitsubishi Chemical Agri Dream Co., Ltd. and Mitsubishi Chemical Corporation, and moved its head office to Nihonbashi-Hongokucho, Chuo-ku, Tokyo, where it remains headquartered.
- 2016
Obtained Resilience Certification as a contributor to national land resilience
- 2015
Took over most of Mitsubishi Rayon's water-treatment membrane and equipment sales business; renamed Mitsubishi Rayon Aqua Solutions Co., Ltd.; head office moved to Osaki, Shinagawa-ku, Tokyo
- 2013
Head office moved to Hitotsubashi, Chiyoda-ku, Tokyo; ISO 22301 registered; became a consolidated subsidiary of Mitsubishi Rayon
- 2012
Separation and Purification Center and Kurosaki Office opened; Philippine Branch established
- 2010
Became a wholly owned subsidiary of Mitsubishi Rayon Co., Ltd.
- 2007
Tohoku sales office opened; ISO/IEC 17025 accreditation registered
- 2006
Hokkaido branch opened; head office moved to Kojimachi, Chiyoda-ku, Tokyo; won Grand Prize and Minister of Economy, Trade and Industry Award at New Business Awards
- 2005
Won Excellence Award at 3rd Courageous Management Award; Central Research Laboratory opened
- 2004
Chubu branch opened
- 2002
ISO 9001 and ISO 14001 registered; Japan Ecology Research Institute (water quality analysis center) opened
Products and positioning
One-stop water-treatment engineering specialist within the Mitsubishi Chemical Group, covering the full water cycle from intake to discharge and separation-purification technologies.
Separation and purification
ISMB™ improved simulated moving bed chromatographic separation system
Pure water
Craspure™ cartridge water purifier
Wastewater treatment
DiaFellow™ series wastewater treatment and recycling equipment
Groundwater
Groundwater membrane filtration system
Water safety
PFAS removal equipment
Pure water
Reverse osmosis (RO) membrane pure water system NDR type
Ultrapure water
Ultrapure water system
Medical water
Medical and pharmaceutical water system
Sources5 sources
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