Diy calcium chloride (A Little Help)

[Razor Ramon]

Took the bags back calcium chloride anhidrous there chemist at the chemical supplier had a breef talk with me said it had been contaminated because it acts like a descant ( no moisture) so it absorbs like a sponge . He figured the factory’s steel containers had rust so it absorbed iron oxide .
That is the red mud that I screened out .
So is it safe no one knows
if it’s iron oxide probly ok
but it would been realy bad if it was used if it’s copper sulphate.
They replaced the product and gave me the contaminated stuff for my drive way.
Thanks all for your input.