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No, I'm not that brave to start testing chalk in my tank. As I mention chalk is natural rock and could have various impurities. The chalk on the picture is from quarry near by.
I don't think using chalk with unknown ingredients is good idea, because there are for sure phosphates, silicates and ferric oxides with unknown concentration in it. Probably the guys from KZ are made their home work and found a quarry with chalk of good quality with low phosphates and silicates. But still in my experience I found that frequent usage of CoralSnow causes diatom and green algae bloom on stones and glass, that's why I decide to switch to pure CC, so far so good.
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