ATI ICP varying ideal values?

[Necrodaemus]

I’ve been noticing a difference in ideal values between ATI ICP tests. Could someone shed some light on why? I’ve attached images showing test results between 3 different people (mine included) and it has me scratching my head…

 

[rtparty]

The “ideal value” is based off the salinity (or sodium and chloride) they test at. I believe it’s the “ideal value for ionic balance” or something along those lines

 

[Necrodaemus]

The “ideal value” is based off the salinity (or sodium and chloride) they test at. I believe it’s the “ideal value for ionic balance” or something along those lines

Now that makes sense and was what I was thinking but wasn’t sure. The results in the image showing substantially lower ideal values (from a user in a FB group) must be running a much lower salinity. The other 2 results are mine and a local buddy’s…we both have salinity that’s nearly equal.