All I know is...carbon will absorb the tannis.
I boiled my 1st piece in a cleaned out turkey fryer, then soaked in a old cooler for about 2 months.
It still stained the water.
Then I started to read threads here on mfk about driftwood.
That's how I came across the carbon idea.
I tried it & it worked.
The next 2 pieces I just rinsed w/water put rite in, added carbon to filter, & called it a day.
I used carbon for about 4 months like this w/no brown water.
Now I no longer use carbon at all.
I am simply writing my experience w/said topic & giving the op my suggestion.
Here are two pics of my setup w/no brown water...enjoy