It is possible that Turface may be contributing, but it is also likely the "partially mineralized" soil is to blame. Dolomite can be a culprit particularly if more than a "dusting" was used. If you used raw clay according to the MTS recipe, this can also be contributing depending on the type of clay being used.
When I spoke to Chris Brown today, he says only a very light dusting on the bottom of the tank of Dolomite is needed for this reason. Even the soil itself may be alkaline depending on what soil was used.
Robert Paul Hudson
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