I just did an ICP test and the results claim a salinity that’s 33.28 ppt.
I’ve been having trouble measuring an accurate salinity for a while because two of my three refractometer calibration solutions (an older Brightwell and a newer BRS) read similar but another read 3 ppt lower. I got a Tropic Marin floating hydrometer to be my absolute reference and it matches the lower solution. My friend also verified towards the lower solution. So I set my salinity to 35.5 ppt based on that hydrometer (just didn’t correct it down the half point before the test) and now the ICP test is claiming I’m still high.
The only thing that would agree with that low salinity reading would be my recalibrated Neptune probe but that jumps a whole point just when I turn off my return so it’s pretty unreliable.
All of this is to give background info for the question: do I trust a Tropic Marin hydrometer or an ATI ICP test where all my other parameters pretty well match targeted levels.
more background: I use brightwell bro marine and only dose BRS two part with occasional magnesium from them too . Nothing else in the last year.
I’ve been having trouble measuring an accurate salinity for a while because two of my three refractometer calibration solutions (an older Brightwell and a newer BRS) read similar but another read 3 ppt lower. I got a Tropic Marin floating hydrometer to be my absolute reference and it matches the lower solution. My friend also verified towards the lower solution. So I set my salinity to 35.5 ppt based on that hydrometer (just didn’t correct it down the half point before the test) and now the ICP test is claiming I’m still high.
The only thing that would agree with that low salinity reading would be my recalibrated Neptune probe but that jumps a whole point just when I turn off my return so it’s pretty unreliable.
All of this is to give background info for the question: do I trust a Tropic Marin hydrometer or an ATI ICP test where all my other parameters pretty well match targeted levels.
more background: I use brightwell bro marine and only dose BRS two part with occasional magnesium from them too . Nothing else in the last year.