JIC anyone gets curious, phosphoric acid can be any one of three similar acids of phosphorus, sorta first cousins, if you will.
Mr. Ken & any other interested parties ..
You may wish to accummulate a reserve supply of 'dirty diesel' now, because low sulphur or no sulphur diesel is already on the horizon. I would think that any municipality running buses would be an ideal donor candidate for REALLY dirty diesel, since many of them spew a visible trail of jet black particulate matter due to having their mixtures neglected, forever. Nothing like inner city driving for acid buildup ;-)