Seaweed could become a game-changer when it comes to cleaning up some of New Zealand's most polluted waterways.  

Almost a million dollars has been spent investigating the seaweed's effect on Waikato's Waihou River, and if successful it could become implemented nationwide. 

Leader of the Algal Biotechnology Research Group at Waikato University Marie Magnusson is involved with all this and joined Mike Hosking. 

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