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Hi,
The liquid residue from olive oil extraction is not exactly toxic, its just that the high concentration of poliphenols, trough its anti-oxidant action, has a disrupting effect on the aquatic ecosystems. Also the oil, which is not soluble in water, takes a long time to be degraded an can physically harmful by adhering to the surface of living organisms.
As for the people swimming, I believe there isn't any immediate danger.
Such discharges are illegal in the EU, so you should inform you local environment authority.
Cheers,
João Correia
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Joćo Correia
Cascais - Portugal
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