Copper Sulfate?

Question

why wouldnt it be good flushing copper sulfate down the drain?

Answer 1

Because it is toxic to many organisms?

Answer 2

Copper sulfate is used as a disease control mechanism for crops. It is highly soluble in water and its effects on aquatic organisms are concerning. By concerning I mean it has a pretty low probable effect level (PEL) and LD50 (lethal dose for 50% of the population).

So dumping it down the drain would quickly allow it into aquatic ecosystems since sewage treatment plants have no way of removing it from the water.

Cheers,

Andrew