Percentage of phosphoric acid

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I am working on a project and am wondering what is the typical percentage of phosphoric acid that is used in your water treatment plant.

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H3PO4 : 75±0.5% ,the ...

H3PO4 : 75±0.5% ,the concentration could be ~80 wt%.

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In wastewater plants that ...

In wastewater plants that I've managed in the past.  There was never a minimum amount of phosphoric acid added to the process. Addition was based on analytical analysis of ortho-P residuals and dosing was administered accordingly. 

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