At temperatures where iron II oxide oxidizes to III state, any iron hydroxide would decompose. Any other impurities but carbon can be washed off.
About chlorine i couldn't even smell any throughout the process.
Nonetheless it works great for thermite.
It's not really "professional" but you can look at the process, see the results and come to your own conclusion about it's viability.
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It supports thepiratebay, nyaa, 1337x, libgen, limetorrents and rarbg
At temperatures where iron II oxide oxidizes to III state, any iron hydroxide would decompose. Any other impurities but carbon can be washed off.
About chlorine i couldn't even smell any throughout the process.
Nonetheless it works great for thermite.