The swimmers are urging as many people as possible to head to the Port Macquarie Olympic Pool to raise some vital funds for emerging star Tom Berryman, who is doing it tough.

Berryman, a national age swimming champion, is undergoing treatment for non-hodgkins lymphoma.

A family fun night is planned, with a barbecue and aqua scrambles at the pool.

Bring your togs and take part in Tom's 1 Kilometre Backstroke Challenge. It involves swimming 1km of continuous backstroke.

The 15-year-old Berryman won his Australian Age medals in the backstroke.

A Progear fat tyre bike will be raffled.

The St Paul's/Mackillop band will provide tunes on the night.

Berryman's head coach, Michael Mullens, said the club was there to help. The pool staff are donating their time to the cause. All admission fees are going into the kitty.

Mullens was confident of raising plenty of vital cash for the Berrymans.

"I'm hoping we can raise a couple of thousand bucks for them," he said.

"At the end of the day, we'd do it for anyone within our community."

The diagnosis was a shock to the club.

"You just don't expect things like that to happen," Mullens said.

"All these kids are bullet proof. You just don't expect things like that.

"He's one of the nicest guys, and this is one of the most upsetting things."

Berryman began swimming at the club three years ago.

He began to think something was wrong in January, when he experienced pain in his right arm.

He stopped swimming in May and underwent surgery in Sydney to remove a six centimetre tumour. He's also undergone chemotherapy.

Berryman is due to finish treatment at the end of the month.

If you can't make it to the night, but still want to help out, donate to the PMASC account. The BSB is 124001. Account number 2237 8627.