The Orange Aquatic Centre re-opened on Friday following a deep clean.
The pool was closed Wednesday and Thursday after two people visited the centre on February 8 with a diarrhoeal disease.
A spokesperson for Western NSW Local Health District said: "The incubation period for Crypto is 1-12 days (usually 7 days) and people present for testing after several days of symptoms.
"This would account for the two week delay."
Orange City Council communications officer, Allan Reeder, added it was re-opened in time for the district school swimming carnival.
"In this case the Aquatic Centre was notified by NSW Health that two people who had earlier visited the pool, had been diagnosed with a cryptosporidium infection," he said.
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"Their visit had happened at a time when they had no symptoms.
"As a precautionary measure, pool staff began a 26-hour 'super chlorination'. The higher level of chlorine treatment means the pool had to be closed during this time.
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