I've updated my original Cleansing Bubbler design to facilitate the return of escaped catalyst back to the cell or reservoir, I call this the Cleansing Bubbler Mk2:

The concept of the mk2 bubbler is that catalyst, that would normally be left in the bubbler in the mk1, is condensed back to the liquid state and returned to either the cell or the reservoir. For extra-protection, the down-tube could be replaced with another coil, however, in my experience with the mk1 this isn't necessary.
As with the CB mk1, it should be mounted where it has access to airflow. This will keep the liquid cool and maintain the condensing effect of the coil.
Russ.