Pump out where you can, dump where you can't???
It's illegal to dump a tank in all US waters within 3 miles of the nearest point on the whole US coastline..which would require you to be at least 3 miles due south of Ft. Morgan at the mouth of Mobile Bay. If you keep your boat in Mobile and sail mostly in Mobile Bay, that's long way to go. Although AL hasn't managed to write enforceable state marine sanitation legislation yet, Mobile Bay is under CG jurisdiction...and they tend to get a bit testy toward boat owners who violate federal laws. FL does have strict marine sanitation laws and enforces 'em. So unless you spend most of your time in open water at least 3 miles offshore in the Gulf, you won't have much opportunity to dump the tank. However, the only "no discharge" (holding tank only) waters in the whole Gulf are Destin Harbor and the waters off Key West...Type I MSDs (CG certified device that treats waste and discharges it overboard) are legal everywhere else. So the BEST solution for you may be to simply replace your hoses (which are the source of your odor, no the tank), keep your existing small tank for use only if/when you visit a "no discharge" harbor and add a Lectra/San...which--if you shop hard--would only cost you about $300 more than replacing your whole system with the Marine Traveler...and would eliminate the need to worry about pumping out. A number of people here have installed 'em and love 'em. You'll find all the specs for it, including the manual, on the mfr's website at http://www.raritaneng.com Don't let the amperage draw scare you...actual consumption for two people is only about 10 AH/day.