Why did my fermented drink get moldy?

[MommaMoo]

I made NT ginger ale a month or so ago. I followed the recipe, except I used two quart-sized jars instead of a one two-quart sized jar. I drank one and opened the other last night and it was moldy. Does that mean there's a problem with the whey? I've also had a batch of ketchup get moldy on me. What am I doing wrong?

[MommaMoo]

*bump*

Anyone know?

[Gale Force]

As it stews you should check it and skim the scum off the top. If it still smells good and has good flavor, I'd consume it.

[staceyshoe]

This may be completely unrelated to your situation but I'll say it just in case it makes sense for you too. A couple of yrs ago I brewed kombucha regularly, using 3-4 different containers. One of them always resulted in mold even though I used the exact same procedures and washed it meticulously. After about 4-5 tries with it, I just started using it to store dry goods. I have no idea why, but there was something about that container that didn't agree with fermenting food.

[Gale Force]

That's pretty wild Stacey. If you ever have a chance to take a picture of the containers, it would be entertaining to at least speculate as to why.