Frenchy,

Yes, the Grabber Mycoal pads are disposable... I'm not familiar with the re-usable type. The Grabbers also have a limited shelf life... I think it's two years.

On the other hand, they are inexpensive, and very non-toxic, so if you have a supply, disposal is not a problem. The also don't require any mixing, etc. to activate- you just open the package and they heat on exposure to air.

Good luck with it.