Zinc and copper - help please

2una · Jan 31, 2018

@ajm83 - In case you happen to be doubtful of your results.
With seeing those different levels of detection i went back looking at my rodi water but with Ati icp this time.
Test done yesterday,wednesday, & it came back clean & doesn't seem to have much nonsense showing up in the result.
Maybe just helps validate what results you getting, then again i suppose it depends on what machine on what day.
Here if it's of interest - https://drive.google.com/file/d/1onVic4D9W4hNc0EtxnDkZvfVdNtdRzgR/view?usp=sharing

JCSaltwaterFishandCoral · Feb 25, 2018

Did test tesults come back ok

ajm83 · Feb 25, 2018

marinadeljohn said:
Did test tesults come back ok

Going to try and send one off next week, will update the thread as soon as it comes back.

Myka · Aug 15, 2018

@ajm83 Is there an update?

ajm83 · Aug 15, 2018

Myka said:
@ajm83 Is there an update?

Yes, sorry I forgot to update the thread - the extra DI stages seems to have resolved it!

I've had my RODI tested twice by ATI since adding the extra DI stages, both times copper and zinc have come back as undetectable. [emoji41]

WDKegge · Nov 6, 2021

Bumping an old thread but wanted to chime in hopefully for anyone else that is having these issues.

I also began having STN on a well established SPS system. Here are my ICP Results:

Without doing an ICP test on my water I believe zinc was getting into my system via exhausted RODI filters (two TDS meters still showed 0) and a combination of old galvanized steel pipes in my house.

Randy Holmes-Farley · Nov 8, 2021

I personally expect that zinc from 0 ppm TDS is not the source. Even without a DI, zinc is quite well removed by reverse osmosis membranes.

ajm83 · Nov 9, 2021

Randy Holmes-Farley said:
I personally expect that zinc from 0 ppm TDS is not the source. Even without a DI, zinc is quite well removed by reverse osmosis membranes.

Interesting, so maybe something else was the issue and the DI merely coincidence.

I wish there were an affordable way to test these elements at low levels at home. The problem with ICP is it's so expensive that you can't easily test after making individual changes.