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Can someone check my math?

I'm trying to introduce some more PO4 into my tank from AP's "pH Down", but
would like someone to check my calculations before I start.

The packaging says that it is 30% phosphoric acid.  I'm assuming this to be
H3PO4 (which should be about 97% PO4).

Is it acceptable to assume that 1 mL of this stuff then represents (1000 mg
x 97% x 30%) or 291 mg of PO4?

Then throwing 1 mL into 291 liters of water should produce 1 mg/L of PO4,

Aaron Ivers