I’m still following along, but wanted to share these so we can have a somewhat balanced view of the options.
http://packedhead.net/2015/triton-lab-icp-oes-testing-of-a-certified-artificial-saltwater-standard/
http://www.reefedition.com/my-triton-testing-results-by-randy-holmes-farley/
@rushbattle - thank you for the links!. Richard Ross is one of my favorite reef authors/speakers, and I am reading his article now. Once I'm done with both, I will post my thoughts.
Have you or your facility used Triton?. If I recall correctly, ATI also provides this service, and I think there are a few others.