09-27-2012, 08:57 PM
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Originally Posted by DragonFyre14
I'm not sure how well it works (especially if there is a high GH and KH which if i understand correctly may conteract this...) but i've heard driftwood can help lower ph. some people use it to lower their PH. I haven't added my driftwood to my tank yet, so I can't tell you how much it lowers the ph by.
There is a limit to the effect. Wood, dry leaves, peat are all organic matter that release tannins in to the water over time, and these tend to soften the water (the GH lowers) and the pH lowers with it due to the acid. But the extent to which this occurs depends upon the water volume, the amount of organic matter, and particularly the initial GH and especially KH. If the GH is high, i.e., hard water, with a high KH, the effect of a tank full of wood will be very minimal. Whereas in soft water with a low KH, a few pieces might effect a drop of several decimal points in pH. Again, the article I linked previously goes into this relationship.