A couple caught up in a scandal involving bottled water supplied to government offices have been arrested for a second time, as customs officers look into whether they lied about where the water came from.

A 61-year-old company director and his 57-year-old shareholder wife were first arrested by the police on Sunday on suspicion of fraud.

The man later appeared in court accused of providing officials with false documents to win the HK$52 million water contract. His wife was not charged and was released on bail.

Now customs officers have arrested the pair again, this time on suspicion of violating the Trade Descriptions Ordinance.

“Our investigation revealed that the bottled water provided to the Government Logistics Department by the supplier involved [allegedly] contained false manufacturer information," said Tommy Kwok, head of customs' trade descriptions investigation bureau.

It's thought the water sold to the government came from a plant in Zhangmutou, Dongguan, rather than the mainland supplier it was claimed to have been sourced from.

Kwok said officers would be going to Zhangmutou as part of their investigation.

The government has since terminated the water contract, with Secretary for Financial Services and the Treasury Christopher Hui saying there had been "problems and inadequacies" in the tendering process.