> Regarding standard Ferrous Copper Chloride solution (which
> may not be what type of chemcials you are referring to), the
> water company actually adds this to the drinking water anyways

To precipitate things like copper ?

I'm pretty sure Fe isn't anywhere near as toxic as Cu. Not that I'd
drink out of a rusty bucket if I didn't have to

Many things are bio-active in minute doses. eg hormones, LSD,
radiation sources. My litre of spent FeCl might not be much in the
greater scheme of things but I'd still try to be good. Unfortunately
we've moved on from sitting around in caves not polluting and there's
some responsibility that comes with that

(I hate the scourge of excess packaging too BTW)

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