Should Driftwood Leaching Lots of Tannins Drop KH & GH? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 01-25-2006, 11:46 PM Thread Starter
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Should Driftwood Leaching Lots of Tannins Drop KH & GH?

Well, I've been bit by this problem before, so I might be being a bit cautious. But, the last time I found it when my pH dropped below my test kit scale, only to find both my KH and GH at 0 (normally, 7+ and 10+).

I bought some new mopani (sp?) DW over the holidays. I'd never seen it for sale before, and this store had dozens of pieces. So, I picked up two nice sized ones (one of which is 20+ inches tall). I've been soaking it in a wash tub, and changing out the water every day or three. Well, one day recently, I captured a cup of tap water during the water change. Three or so says later when I checked, the KH and GH in the wash tub were both below the tap water...though neither was down to zero.

Would others expect this result? As tannins are acidic, I guess I'm not surprised. But once bitten, twice shy.

Also, would boiling help? The wood is self sinking, and one piece would have to be boiled in 'sections'. But, would that help 'cure' this problem?

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post #2 of 4 (permalink) Old 01-31-2006, 06:39 PM
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IMO Boiling big pieces is a waste. You will manage to disolve out more tannins then you would in cool water but you'll never get them all out by boiling and unless it were a very small piece I don't think it would make a difference at all. It might slow it down for a day or two as you may sucessfully remove the tannins at the surface of the wood, but as the water permiates it more will continue to seep out. Long term I think boiling will be a waste.
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post #3 of 4 (permalink) Old 01-31-2006, 06:48 PM Thread Starter
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Good input. From some searching after my post, it appears that most folks did advocate boiling. But, I've been busy, so the soaking (starting w/ hot water) has continued. The rate of leaching seems to be slowing, and I need to go do some more water tests to see if the KH/GH are still trending downward. Though some of the posts I read talked about KH dropping, the only other posts that talk about GH dropping are my own .

So, maybe I'm just not good at picking out driftwood !
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post #4 of 4 (permalink) Old 02-01-2006, 05:33 AM
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I just use Purigen to adsorb all the tannins, works perfectly and it does all the "work" so you don't have to.
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