Question for the Metal Masters, or other chemical types

[mbar]

I'm not sure, but my guess would be that a cup would probably be plenty. You could probably dissolve a bottle of vitamin C tablets in the bucket and it would be enough. You will know that there is enough when you see the metal stains start to lift very quickly. Let me know how you make out

[ChuckD]

So my wife picked up a bottle of Vit. C tablets (chewable, and quite tasty). After tasting one, I reluctantly dumped them in said 3 gal. bucket added hot water and then the filter element.
Next day the water was real rust colored, and the element looked... better. There's still staining on it which is likely the other sediments that might be found in ground water.

So it seems like a worthwhile endeavor. Thanks for your help!

C.