Olympic results from DAY FIVE, Rio 2016 Games LIVE: TEAM GB GOLD MEDAL UPDATES

There is no official reason yet – which is a concern in itself – but it is believed to be an increased amount of algae is the root cause for the green pool that stunned competitors and fans alike during the final of the women’s synchronised 10 metres platform final – and probably now the water polo pool.

Nathaniel Storey, a microbiologist from the University of Reading, said the two main possibilities for the green colour are algae or copper in the water.

He said: ‘If the pools are not adequately treated then an algal bloom can form. The bright green colour itself is caused by the chlorophyll that algae use to convert sunlight into energy – the same substance that causes plants to be green.

‘Algae spores can be brought in by wind and rain. The best way to stop algae is to prevent it in the first place by maintaining a good pool sanitising regime. If it is in fact caused by algae the water should be a cloudy green colour, making it difficult or impossible to see the bottom of the pool, and the sides and bottom of the pool may have a slimy feel to it.

‘Treatment is more difficult as time goes on but requires either ‘shocking’ the water with high levels of chlorine, although some algae can be resistant to lower levels of chlorine, or the use of specific algaecide agents.’

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