'If Bali doesn't #DoSomething serious about this pollution it'll be impossible to surf here in a few years. Worst I've ever seen,' Kelly Slater tells his Twitter followers.

WORLD surfing champion Kelly Slater says Bali's beaches are littered with the "worst pollution" he has ever seen.

Slater, who has won 11 Association of Surfing Professionals world championships, voiced his concerns on popular micro-blogging website Twitter on Sunday (Melbourne time) from Bali.

"If Bali doesn't #DoSomething serious about this pollution it'll be impossible to surf here in a few years. Worst I've ever seen," he told his hundreds of thousands of followers.

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A foreign tourist walks past debris and rubbish at Kuta beach. Photo: AFP

When asked by a fan to elaborate on the source of the pollution, he tweeted: "Everything. Plastic, random rubbish, medical waste/needles on beach. Disgusting. Smelly water. Really sad."

He said solutions to the problem would require support from multiple industries.

Slater later re-published but did not respond to a follower's suggestion he make a documentary to prompt the Indonesian government to examine the problem.

A rubbish collector walks past a pile of garbage on Kuta beach. Photo: AFP

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Bali beaches 'most polluted': surf champ