The Planted Tank Forum - View Single Post - Using Oil-Dri for cheap substrate?
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Old 09-09-2012, 03:13 PM   #34
Trickerie
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The carbonates being absorbed isn't a huge deal, as long as you don't allow the pH to crash drastically. As long as kH is 1-2 you will be fine. My kH out of tap is only 1, and I've never had any issues. When I first started with the sts, I simply added some baking soda for the first 3-4 water changes. Since then, it's been completely fine. The sts has a very high cec, so this behavior is expected. It's not all bad, either, because these minerals will be kept for the root systems in the substrate. Don't be afraid to use sts because of this. The fact this occurs makes the substrate VERY good.
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