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A leading water expert has backed plans for an ocean rock pool next to the groyne at Cottesloe beach.

Veteran Cottesloe Surf Life Saving Club member Tom Locke said the University of WA's Centre for Water Research director Jorg Imberger had thrown his support behind the plan and dismissed concerns, such as seaweed build-up, as "no big deal".

"I've met him several times and he's told me unequivocally that, 'Yep, it can be done'," Mr Locke said.

He said Professor Imberger, who is overseas, had agreed to have a question and answer session about the idea at the Town of Cottesloe.

In March, Mr Locke broke away from the Cottesloe Beach Pool Committee, which backed a free-standing, onshore pool between the Indiana restaurant and north of the Cottesloe groyne, because it did not incorporate the ocean and was too commercial.

Mr Locke argued a genuine seawater pool would be better because it would allow people to feel like they were swimming in the ocean without the fear of sharks.

He said the pool, which could be built for $1 million to $2 million, would also provide protection against the Fremantle Doctor.

"People need to consider, for example, there are 500 nippers in the Cottesloe surf club and their families," Mr Locke said.

"Will it give them a safe and relaxed entry to the beach?

"Can they learn to swim in a safe environment that's in the ocean, that isn't in the chlorinated pool?

"The answer is yes."

He said it could be designed so seaweed flushed in and out.

"At the very worst maybe every few years they may have to put a simple suction pump that will float around with a lawn mower engine to suck and clean it out a bit," he said.

Opposition Leader Mark McGowan this week reaffirmed Labor's commitment to build ocean pools in Albany, Cottesloe and another Perth location in the first term of a Labor government at a cost of $10 million to $15 million.