I think if you pour hot water on a plant, heated in any way, its going to start to wither away.
I boiled my carbon yesterday before using it and a lot of crap came out of it. I didn't test to see if phosphates had leached out but I assume they may have. In any case, I will always boil carbon first. After boiling, I rinsed it in RO and I was impressed with how little the RO water washed out of the carbon, it was relatively clean.
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