The flooding, which has happened on at least three occasions, started in the Gungahlin development's pool plant room on the fifth floor, before leaking down into lower apartments and communal hallways, as well as all four levels of the building's car park.

Documents obtained by The Canberra Times show developer Geocon declined to rectify the issue when requested by the building's executive committee.

This was despite the advice of an independent hydraulic engineer brought in to assess the issue, recommending all six filters need replacing.

The flooding was first reported on March 13, before a second incident happened in the middle of the year.

Footage uploaded to social media of the first flooding incident shows water cascading down levels of the car park underneath the building.

A third flooding incident, believed to be caused by the same pool filters, happened on September 27 resulting in the pool being closed off to residents indefinitely due to health risks.

In a letter to Infinity residents by the building's executive committee on November 26, engineers were brought in following the September flooding to assess the pool plant room to determine the cause of the flooding.

"This decision was made following advice from the pool servicing contractor that the current filters were domestic and unsuitable for the site," the letter said.

"The hydraulic engineer assessed all six pool filters and advised that they were not fit for purpose and needed be replaced with commercial filters of a higher capacity."

Replacement of the filters under warranty was not presented as an option.

The executive committee requested Geocon finance the replacement work on October 31, following the assessment from the engineers.

However, in their response on November 8, Geocon declined to accept the advice of the engineers and said they would try to replace the domestic filters under the existing warranty.

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"Both the pool servicing contractor and the independent engineer have refused to work with retaining the existing domestic filters due to them not being suitable for site and the likelihood of further equipment breakdown," the committee said in the letter.

In a statement, a Geocon spokesman said the development company was aiming to resolve the issue.

"Geocon has put forward a proposal to the executive committee to rectify the pool plant at Infinity and we are awaiting approval from the committee to be able to rectify works before Christmas this year," the spokesman said.

"Geocon apologises to the residents at Infinity and is committed to rectifying the works."

One Infinity resident, who declined to be named, said the flooding at the complex had been significant.

The resident has lived in the complex since the building was opened, and said those living in the building have been frustrated by the lack of progress.

"The car park was leaking water like a waterfall, and it started leaking massive amounts of chemical water," the resident said.

"it was like going through a car wash."

The resident's car suffered damage in the flooding due to the chemical water hitting the car in the incident.

"A lot of people are saying they're unhappy," the resident said.

"They haven't opened up the pool since September because of it."