I believe the way other's have tested is by putting the carbon in RO/DI water that had previously tested 0 for P04 and then re-tested afterwards. Not the most scientific method, but shouldn't that be good enough to show if there were P04 existent?
That could rule out of the product has PO4 in it, but wouldn't rule out whether it absorbs PO4 and later can't hold on and lets go back into the water. I'm wondering if that is what they mean.
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