Has anyone heard of these. They are used to filter debris from sink waste water. In my view this water should not go down a drain to a treatment works - a waste of energy and chlorine. Once it is filtered it is perfectly OK to let it soak into the ground. I gather a "bomb" is shaped rather like a rugby ball, it contains a filter and you attach the outlet from the waste to one end and the other just flows out onto the ground. To avoid an angry/moral debate on the rights and wrongs of this - I would only use this on rally sites. I think regularly used caravan sites could end up water-logged and messy.