Marubeni Corp., the owner of Chile's third-biggest water company, will spend ¥25 billion to double the size of its international water assets in two years.

The trading house plans to buy water-service companies in Southeast Asia, Australia and the Middle East as well as add to assets in Chile and China to double the number of people it supplies to 10 million by March 2013, Yoji Ibuki, head of Marubeni's environment infrastructure unit, said in a recent interview.

The company this month completed a ¥40 billion acquisition of Aguas Nuevas SA of Chile and the proposed investments will propel the company into the top 10 global water providers, Ibuki said.