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Re: Fluorides, POTW influent, & metal finishing

Flourides are common in iron phosphate conversion coating formulations intended
for use in the treatment of mixed metals ( steel , aluminum, galvanize) prior to
painting.  This is also the case with zinc phosphate conversion coatings.
Acidified aluminium etchants may be another source.  Truck wash formulas could
contain flourides for brightening of stainless steel.