Hydration cells

Ok, I feel slightly stupid.

Whenever I use a hydration cell up, for some reason I am stuck with an empty hydration cell, that I can not fill up again with anything. So what, just macerate the leftovers? Or is there a trick that has eluded me thus far?

Quote from Alblaka

Recycle it? lol.
There's no way to regenerate hydration cells and no way to reuse them after they're empty.

Well, I hadn't actually tried recycling them. Guess I will continue tossing them in the lava pit then. Thank you very much