Raritan Elegance is the only way to  go.  It is fresh water flush which will eliminate the smell associated with sea water flush. Not much maintenance except Joker valve which seems to be a tad sensitive to back flow and buckles.  Good advice re Peggy Hall she personally directed me to  the Elegance head, no regrets.  Her book is excellent as well. Russ "Since you cannot do good to all, you are to pay special attention to those who, by the accidents of time, or place, or circumstances, are brought into closer connection with you." St Augustine