Sorry, I did not mean to say or suggest you made a wrong decision. ATI includes RO/DI. Just something to be aware of should you continue to use these sort of tests in the future. I believe they have their place but they also have some questions, regardless of who we use, regarding their own quality control and processing / handling standards.
There are a couple articles here one of which I believe @Thales was part of that did a great job of discussing ICP tests. The comment section is also a good read.
If it is helpful, here is my local copy of the article - reefsmagazine is going through some reorg stuff.
Skeptical Reefkeeping 12: Triton Lab ICP-OES Testing of a Certified Artificial Saltwater Standard
From ReefsMagazine By Rich Ross and Dr. Chris Maupin At MACNA 25 in Denver, the potential for the new ICP-OES aquarium water testing by Triton Lab in Germany made many saltwater hobbyists swoon. Th…
packedhead.net
The short version - these hobby testing outfits are using ICP in a way different from design, and we don't know what they are actually doing - they say it is proprietary, and that gets even weirder now that there are several companies offering such testing. The instruments are complex and we don't know how they are being maintained. If what they are doing worked really well, all people that study ocean water would be doing it, but they aren't. Are the ballpark numbers good enough for you...that is up to you.
Recently I did and ICP test and it came back with Arsenic which is really weird, so I contacted them. They corrected the reading so there was no Arsenic. That makes me squint a lot.


