Circulating water
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Phosphorus-free corrosion and scale inhibition agent Zh232D is being used; why was a total phosphorus level of 1.72 detected in the circulating water recently?
It’s not possible to achieve true phosphorus-free status yet, but low phosphorus levels are possible. How much is this product?
It might be due to phosphorus in the added water; it is recommended to conduct a test and then multiply by the concentration factor. Or perhaps you are using a low-phosphorus regimen, rather than one with absolutely no phosphorus