Rick
Well-Known Member
but agree that primarily its the pH that is relevant here. But, you do agree that liquid in contact with marble would not stay acid for long?
Totally agree, that is the point of that little test I did with the aragonite in moss.
Seems like most of the debate may be caused by mixup in terminology. Or maybe you are thinking with a Norwegian accent and I am loosing track in my English
When you said that you saw no difference in using olivine instead of marble does that mean you (A) saw no positive improvement with olivine, or (B) or olivine was just as good as marble? (BTW olivine looks pretty much looks like the "serpentine rock").
If your answer is B, then pH/alkalinity for pot environment is indeed the parameter we are looking at.
I did see a comment in a previous post that said that seepages impacted by limestone are "nutrient rich". I can attest from testing well waters and seepages in limestone areas that they are virtually devoid of N and K. Some local systems have elevated P (maybe a few ppm at most). The bulk of the TDS is some mix of calcium and magnesium with varying amounts of sulfate, chloride, and bicarbonate. Also as you predicted with the roth example, the amount of TDS is highly variable depending on rainfall, contact time, and variations on the crystal hardness of the rock. Many seeps have very short contact times coming from shallow perched aquifers. Those waters generally have very low TDS compared to deep water wells pumped from under the same geology.