Randy Holmes-Farley
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I do not know the answer, but I do think that the suggestion of degrading organics from the rock is certainly possible.
I would also note that nitrate may not be elevated, just ammonia and a bit of nitrite. 1 ppm nitrite can read with a nitrate kit as 100 ppm nitrate, even with zero nitrate.
I would also note that nitrate may not be elevated, just ammonia and a bit of nitrite. 1 ppm nitrite can read with a nitrate kit as 100 ppm nitrate, even with zero nitrate.