Hey! Since this is my product, I figured I should chime in.
We have been developing this over a few years, starting with a three part formulation based on
@Randy Holmes-Farley's DIY solution, then later evolving into a true Two-Part.
We have been fine-tuning the trace and minor element blend based off of our own observations, as well as both customer and our own ICP-MS tests (we run the two part on all of our systems, and have been tuning it to keep levels as stable as possible over time).
We use the highest purity of ingredients we can fine (many are ACS Reagent grade, including our calcium chloride), and make every set in-house to ensure consistency between batches.
Happy to answer any questions anyone has!