After a couple of days "hands on" with my prototype I do have one observation I believe worth noting. Stirring, agitating the container, etc. without an airstream vented outside would tend to generate fine particulate suspended in the atmosphere as things dry. The extent to which this dust might be contaminated with fecal associated pathogens is something I heretofore have not considered. This might be a point to consider when one thinks about where this apparatus is to be used, i.e a rolling pitching boat with limited ventillation below decks.