I suspect the first thing you need to do is
Replace the toilet...after 14 years, it's prob'ly so obsolete that, with the possible exception of a rebuild kit (all the rubber seals, valves etc), no parts are still available for it. Even if you can still get a rebuild kit, unless your luck is better than mine, something will break that can't be repaired immediately after your install it. If it's electric, the lubrication in the sealed motor has long since settled, ceasing to provide any corrosion protection. Same is true of your bilge pumps, fresh water pump, and anything else that has rubber parts and an electric motor, btw. If they work at all, they're not likely to work very long. After 14 years on the hard, none of the hoses (fuel, exhaust, fresh water OR sanitation) are likely to be salvagable...hoses dry out, become brittle and crack. I wouldn't trust ANY of 'em...I'd replace 'em all. Then there are the seals and gaskets in the engine...same thing. And Lord knows what else, including the wiring. You've got a LOT of work to do to make a 21 year safe and reliable. My last one was only 16 years old and had only sat for 5 years when I bought it...I had to replace just about everything on it, 'cuz lack of use is FAR more destructive than even hard use. However, I bought it knowing that...I hope you did too, and that you had a full pre-purchase survey. Btw...you asked about the sanitation "system"...what else does it have besides a toilet?
