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- Sep 21, 2018
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ICP measurements of P are likely to be wrong ALL the time. The vendors are not being transparent about water sample degradation during transport.Randy - my Hanna ultra low (and Hanna ref PO4 checkers) always comes in at .12 to .2 ppm PO4. Any icp test I’ve done show phosphorus reported in ppm (not PPB) and show I’m at .02 ppm phosphorus. These don’t jive at all on conversion. I don’t have much algae, but my lps are never thriving. All my other parameters are usually good. Any advice?