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The SA Swimming Nationals have been called off for a second straight day at the Newton Park Indoor Swimming Centre in Port Elizabeth.
It has been postponed to 6pm on Thursday evening and will no-longer serve as a World Cup qualifier.
EP Swimming officials say the water is still green with a high chlorine content making the pool unsuitable for swimming.
Problems began on Sunday when a water pump burst and South Africa's top swimmers had to swim in a green pool on Monday.
Swimming was called off yesterday, shortly after the warm-ups began.
AlgoaFM News understands that there was a new problem with the water pipe serving as the main feeder into the pool on Wednesday morning.
This resulted in water being cut-off to the toilets at the Newton Park Swimming Pool.