Thanks, the HCL seems like a better choice. Can I do the same for my chelated iron solution? I was told I had to the water with the container in it to sterilize it, but if I can do HCL then that would be much easier.
I don't know why it couldn't be. Bacteria require iron, so it sounds like a good idea. All the methods should effectively prevent mold and bacteria. Ascorbic acid is able to reduce the ferric Fe-EDTA to ferrous Fe-EDTA, turns the solution green but benefits plants that prefer ferrous iron to ferric iron and reduces the energy expended by the plant to reduce the ferric Fe.