Acid #5 and Acid #6 Disposal

[bhamripper]

So I got Acid #5 and Acid #6 for cleaning and passivating of my conical and kegs after PBW wash. My question comes what to do with the acid solution after I am finished? Can it go down the drain without any treatment? If not, how should I treat it before disposal?

 

[Homercidal]

Did you find out how many times you can reuse it?

As an acid, and not toxic I believe you can just flush it. The website says it's biodegradable.