Dave, you may know boats, but
"The most often cause for boats smelling with holding tanks is the failure to add deorderizing solutions and of course failure to pump out on a regular basis" just plain ain't so. HOW can a holding tank--unless it's leaking, which should be obvious because there will be moisture around the tank--be the source of odor INSIDE the boat? Holding tanks don't permeate.Blaming tanks for odor inside the boat is only perpetuating erroneous "folklore." Plain ol' fashioned logic SHOULD tell anyone capable of thinking logically at all that, unless a tank is leaking, there's only one POSSIBLE place for odor inside a tank to go: out the vent. It CAN'T cause odor INSIDE the boat.So it doesn't matter what products are used in the tank, or how often it's pumped out, or how meticulously you rinse it out...you're NOT gonna cure odor inside the boat by working on the inside of the tank or even by removing the tank. The ONLY sources of odor inside the boat are permeated hoses, dirty bilges, dirty sumps, chain lockers...because they're all INside the boat. Pouring vinegar down the toilet MIGHT reduce odor causes by waste trapped in the head discharge line due to incomplete flushing, but it won't do a thing for odor caused by stagant water trapped in the head intake or the channel in the rim of the bowl...nothing poured down the toilet goes through the intake side of the pump. Nor will it do a thing for permeated hoses or a wet dirty bilge or sump--the sources of 99.999999% of odors inside a boat. If you only knew how many calls I've gotten from people who've ripped out their entire sanitation system--often because dealers like you told 'em to--trying to get rid of what they thought was "head" odor, when all they really needed to do was clean--really CLEAN and flush all the dirty water out--their bilges and sumps. As for your approach to toilet lubrication...anything you pour down the toilet only washes out in a few flushes...and you only do it occasionally--which I assume means, when it finally gets so hard to pump you have not choice. Would you treat a boat engine that way...or neglect rigging to that point? So what makes the toilet any different?Pumping a manual toilet without adequate lubrication wears the seals and scratches the inside of the pump cylinder. The first flush can put enough strain on an impeller to crack a vane in an electric toilet. Friction heat from running dry, even momentarily, “fries” the edges, reducing its efficiency a little more each time. Dry rubber and neoprene—especially if it’s salt encrusted, scratches the housing. Even with constant live-aboard use, over time both seals and pump cylinders wear, and because it’s people, not a precise machine, who pump manual heads, they wear unevenly. The best cure is prevention....and all it takes is 10 minutes once a year to remove the top of the pump, put a healthy squirt of Superlube in it, pump a few times to spread it all over the inside of the cyldinder...put the top back on...you're done till next year. Sure beats pouring oil down the toilet every time the toilet becomes so hard to pump that you have no choice, so why not do it right just once a year as PREVENTIVE maintenance that can double the life of the toilet? Sheesh, Dave..none of this is rocket science, it's just logic and common sense. So if the main difference between men and women is SUPPOSED to be, men think logically, women don't...how come I get it, but you don't? And apparently neither does Bob.