Wow. Was testing out my tub water storage with one of those aqua pods by filling it in a second tub and leaving it for a couple of months. Found out the other day that there was lots of mildew on the bottom of the tub--no mildew however in the plastic interior.

There were no visible holes; It did not appear to have leaked, as it was still full to the top; the tub was very clean when I put the aqua pod in there and filled it with water.

Any ideas what happened? Lesson learned is always test your prep products before you need them.