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Old 06/23/2021, 09:26 AM   #3
Lou Ekus
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Join Date: Nov 2003
Location: Ma, USA
Posts: 39
Lanthanum chloride and PO4 reading

@Gilby180 guess is that the crystals formed by the reaction of the PO4 and the lanthanum chloride have some effect on the optics of the Hanna checker. I seriously doubt that the actual PO4 concentration has gone up by that much. Once the PO4 is bound to the lanthanum chloride, it will not go back into solution. If it were me, I would try a PO4 reading with a standard reagent test kit and see what you get.

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