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Old 03-03-2015, 03:49 PM   #1
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Join Date: Jun 2012
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VacuFlush Toilet Question

I have a 2015 Southwind 34A with the SeaLand Dometic VacuFlush System toilet. From all the problems/solutions/comments I've read on here I think I finally understand why it was installed and now know a lot of problems to watch for. I really appreciate all the inputs people have posted.

I'd like to know if there is a problem turning the toilet off and gravity- flushing just liquid waste. It doesn't sound like this would be a good idea for solids, but it seems that liquid would find its way into the holding tank even without a slanted pipe.

The advantages would be
-fewer times we and our neighbors have to listen to that obnoxious vacuum pump noise and,
-with fewer uses, maybe the maintenance cycle would be extended.



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Old 03-03-2015, 05:05 PM   #2
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Fleetwood Owners Club
Join Date: May 2013
Location: CT
Posts: 613
johntk, to answer your question, no, you definitly should not try that. The liquid waste will accumulate in the flex line and the vaccum generator, and never make its way up to the black tank. I know it is noisy,learn to embrace the sound, for it will tell you when some thing is amiss. This may sound gross, but consider a sanitary system that you can live with to NOT put any paper of any brand or type thru the system. Mostly unspoken system, but someone has to say it . Read my post in fleetwood owners area flushed the vaccuflush, it will enlighten you as to what I have been through, and done to make it easier to live with. The BEST advise I can give you is to run water after flush, holding petal down for a count of 5 to 10 seconds before lifting foot fast to let clamshell SLAM closed. Goes against everything that everyone has always been taught to go easy, but it needs to slam shut to seal correctly. The extra water will help keep duckbills,pump,and inside of flex hoses cleaner,therefore hopefully less maintainance. Oh, and would also be a good idea to carry toilet seals,fill valve, o rings ....just in case . I have an account with northeast marine sanitation, great guys, very helpfull. hope this helps.


Rapid Rick
2013 Fleetwood Terra 35K
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Old 03-03-2015, 06:28 PM   #3
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The liquid waste will crystallize in the hoses. Over time that will cause clogging.

Some suggest pouring vinager in, once in a while, to break it up.

I tell all users to to step down fast, count to 5 and then slip their foot off the pedal.

We use single ply paper and always make sure it is down, before letting the ball snap shut.
Loud, but good system

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Old 03-04-2015, 06:07 PM   #4
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Join Date: Jun 2012
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Thanks for the info. Sounds like I'm stuck with the noise and extra maintenance.
Someone posted that if the toilet is above the tank it can be switched for a gravity system. I took a quick look at mine and think the toilet is too far forward - so I guess that's out. Probably too expensive anyway.

Again, thanks for taking the time to respond,
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