> What is "contamination" though, 1ppm? 20ppm?

According to some toxicology reports on the web, 5ug/l of copper
chloride is the lower limit for aquatic life. Not much is it ?

IOW 180,000,000 litres per kg or 21,000,000 US gallons / lb

A cube with 56.4m (181ft) sides

That's why I don't tip it down the sink

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