Leaching tannins, how long? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-13-2005, 01:24 AM Thread Starter
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Leaching tannins, how long?

How long does it take for a piece of wood to stop leaching tannins?
The particular chunk of wood I'm waiting on is supposed to be Mopani.

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post #2 of 7 (permalink) Old 06-13-2005, 09:08 AM
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I will disapoint you but it may need several months,I suggest if you can take it out of the tank put it in a large body of water so you don't have to do often waterchanges
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post #3 of 7 (permalink) Old 06-13-2005, 02:54 PM
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I'm not expert (you can see my post on the problems I had), but I think I've learned something useful.

After you soak your wood (for weeks), it's not enough to just scrub it with a brush. Take something (I used a screwdriver) and check for soft stuff. While the soft stuff was there, my wood was still staining the water within a few hours. But after letting it sit in a bucket overnight after scraping all the soft bits off, the water is clear this morning. Maybe the prolonged staining from Mopani wood comes from little bits of softer material that get left behind in knotholes and crevices.
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post #4 of 7 (permalink) Old 06-13-2005, 04:29 PM Thread Starter
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Quote:
Originally Posted by observant_imp
I'm not expert (you can see my post on the problems I had),
Quote:
Originally Posted by observant_imp
Take something (I used a screwdriver) and check for soft stuff.
By golly I think you've got it, Cheryl!! You could make the prototype

~ NEW Mopani crevice soft-bit-remover~ , patent that baby and there's your ticket out, man...or er, I guess everybody could just use a screwdriver.

Quote:
Originally Posted by observant_imp
But after letting it sit in a bucket overnight after scraping all the soft bits off, the water is clear this morning.
Thank you for sharing, I'm eager to give it a try.

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post #5 of 7 (permalink) Old 06-13-2005, 07:59 PM
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A good scrubbing brush with stiff nylon bristles works well, scrubbing is very important, I just did this on a large oak stump for my 90 gal I soaked for 1 month with frequent wc scrubed and rinsed it twice and boiled it for an afternoon, then scrubed and rinsed it again. It still leached tanning in my tank for over a month. . . now I kinda miss the light tannin look
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post #6 of 7 (permalink) Old 06-13-2005, 08:26 PM
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I found some wood outside and soaked it for about a month till 1 piece sank and 2 weeks for the other, but I had to boil the wood for a total of more than 24 hours! The water still didn't boil totally clear after that but I stuck it in the tank anyways. Haven't had any problems... not yet at least.

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post #7 of 7 (permalink) Old 06-13-2005, 08:47 PM
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I got some mopani wood from a guy on ebay. I had 3 nice sized pieces that I put in the same rubbermade container that is ~5-10 gallons. The pieces were to big to boil so I would turn the hot water on untill it was as hot as it could get then I would fill the container up. I don't know how hot the water heater is set at but I can't touch the water. I changed it with new hot water 2-3 times every day for almost 2 weeks. Then I put 2 of the big pieces in my 72 gallon bow and I haven't got any visible discoloration of the water.
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