The demolition of a paddling pool in Pontypridd will go ahead as part of a £6.2m to regenerate the lido in the town.
Local residents had voted overwhelmingly to keep the children's pool in Ynysangharad Park, but the council has said it cannot afford to renovate both the lido and the pool, and that plans already include a modern, heated paddling pool.
The new lido, which would be open for about four months a year, will include a new 25m pool, activity and splash pools, changing blocks and other facilities including a new cafe.
The original lido was built in 1927 in an arts and crafts style, and is the only listed lido to survive in Wales. It closed in 1991 and has since fallen into a state of disrepair.
The scheme has attracted £2.3m funding from the Heritage Lottery Fund, and the council is now hoping to secure additional European funding.