Mr Gosney said the whole centre was back in business with a marked reductions in noise levels.
Eleven spans of Autex acoustic fabric have been built into the ceiling structure to buffer the noise created by large numbers of people using the pools.
Until now the sound readings in the recreational side of the centre showed sustained noise levels of up to 85 decibels, particularly during school holidays and after school.
Mr Gosney said these levels were uncomfortably high, especially for the lifeguards and swimming instructors who spend long periods of time there.
Aquajet swim school instructor Christine Strichen said she and other staff had noticed the difference already.
"The noise level has dropped and we're finding we don't have to yell to be heard," she said.
"Without the echo, our classes will run smoother and the children will reap the benefit - the acoustics look good, but most of all, it works."
Karen Hughes, from Sport Wanganui, said the project involved several Wanganui companies.
Shade NZ carried out the acoustic installation, specialist fastener company Anzor supplied the stainless steel fixtures and fittings, Taylor Engineering supplied and installed the mounting brackets and Stewarts Electrical Supplies provided the PVC piping to cover the wire.
Ms Hughes said three poles take the pressure of the tension on the wires holding the acoustic panels up but they needed specialist advice around the weight and the tension of the wires, and the stainless fixtures.
When the pools were emptied scaffolding about 8m high was set up in order to get the panels attached to the ceiling.
The panels' wave shape helps to break up the sound waves.
The Splash Centre complex will reopen today with free admittance to the hydroslide between 1pm and 4pm; normal entry fees apply.
