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?