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Thank you for sharing your experience. I think this could be a phosphate precipitate, most likely calcium phosphate or struvit (ammonium magnesium phosphate).@Hans-Werner I did try AFR and Plus-NP in the same container at a 19:1 ratio but I noticed it's a bit cloudy and after 1-3h there is a white substance on the bottom of the container. It will mix again if I shake the container a bit but I guess this will not allow me to auto dose both of them using one doser.
If possible, stirring might be advantageous. The precipitate may most likely limits the use as a nutrient supply but it will not lower the calcium and alkalinity supply much, so you still can use it like AFR.
Regarding nutrients you can give it a try. If nutrient concentrations in your tank don't show the expected development or concentrations you may have to dose some Plus-NP manually.