Quote:
Originally Posted by bertoni
ICP-OIS tends to be fairly inaccurate unless run very carefully, and careful testing is expensive. Tests run for hobbyists have been shown to have problems with trace elements, for example. I'd be cautious about trusting the results.
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I will say that I have confirmed some of the low numbers on the ICP-Analysis. The salinity was correct and the potassium seems correct based on the Salifert test kit I got. The salinity was verified with my refractometer after getting some 35ppm calibration solution. Ordered new lights though still as I think the XR15W Gen 4's will put out better spectrum than my Gen 2 (non pros - so no UV).