Here's a great video/presentation from this year's MACNA, it's by Ehsan Dashti (founder/owner of Triton). It's a long video but he goes into great detail about the Triton Method, Triton Testing(ICP Testing), and the history of the technology.
It's interesting to hear perspectives from someone so advanced in the hobby. The testing is done in-house, and it sounds incredibly complex... With very expensive lab equipment ("inductively coupled plasma tests splitting your water sample into component atoms suspended in a fiery 10 000°C plasma").
....I wish I could afford regular (or even a singular) Triton testing.