ICP-OES results were received today. Results consistent with test kits.
High tin (Sn 16 ppb) was found. Previous ICP-OES results from Dec 2017 where also high in Sn (23 ppb). I ignored it as not possible last year (mistake). But after receiving results today, it shows that the original result was not due to laboratory error. I have had some issues with Acro growth and STN which I thought was due to other issues.
Source of contamination is not clear at this time.
Only slight rust on cabinet brackets (possible root cause)
No rouge metal or magnets found (root cause ruled out)
VWR (read higher quality) stainless steel tongs. (possible root cause) I will replace.
No PVC (root cause ruled out)
Ecotech MP10s. (possible root cause, not ruled out). But I'll pause before buying new wet sides as both are NMT 2 yrs old.
Source RODI and SW mixed water - unknown. RODI water is NMT 0-1 ppm. I will likely send for fresh SW test as it could be the barrel, power head or heater in mixing station.
Reading up on the issue, it looks like the best course of action is treatment with CupriSorb.
Any opinions?
ICP-OES Results 21Oct2018
ICP-OES Results Dec2017