The pool, which is owned by Inverclyde Council and managed by its partners, Inverclyde Leisure, closed in early September to allow for the replacement of its moveable floor.
Contractors began by draining the 725,000 gallons of water from pool over four days before installing the new £400,000 floor.
Education and Communities Councillor Jim Clocherty, who also sits on the Inverclyde Leisure board, said: "It's great that this work has been completed on time and the pool is going to reopen.
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"Having a moveable floor is a fantastic resource for our swimmers and I’m delighted it's been replaced.
"We have first class facilities here in Inverclyde and as a council, we are pleased to support them."
During the closure, additional work to install new led lighting and grout the pool was also carried out.
Once the main pool reopens, temporary timetables at the Waterfront Leisure Pool and Port Glasgow Pool will revert back to normal.
Gourock Pool closed its doors for the 2023 season last Sunday. The iconic outdoor pool had extended its season as a result of the closure of the Waterfront main pool.
It celebrated the end of its season with a Doggy Dip on Sunday afternoon where pooches and their owners took to the water together.
