Lab analysis

[Randy Ruiz]

I have had NO3 & PO4 at zero which is hard to believe. However that is using APS tests which I wa thinking should show ballpark readings. So I'm upgrading to Salifert tests. I've also been wondering about other trace elements. So thinking about sending water to a lab for analysis referred to as ICP I believe. Are there certain labs better than others for this or should I just use any local lab?
Thanks

 

[rkpetersen]

The two German labs seem to be the best for ICP-OES.
Triton will test your phosphorus but provides no information on nitrate level.
ATI does everything Triton does but will also test your nitrate and alkalinity levels.
ATI will also test your RODI water at the same time.
And ATI is slightly less expensive than Triton.