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Old 09-15-2021, 04:34 PM   #1
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Macerator question

Sorry if this has been covered but I am sitting at home without my manuals.. what procedure do you all follow when storing your coach related to your macerator toilet? It doesn’t feel right leaving water in the bowl…
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Old 09-15-2021, 05:41 PM   #2
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I leave water in the bowl so that the deals don't dry out.
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Old 09-15-2021, 07:30 PM   #3
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I leave water in the bowl so that the deals don't dry out.


Thanks, do you do this on a macerator toilet? The flush is a little different than my gravity toilet. There is no blade with a seal. It’s more like a house toilet.
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Old 09-15-2021, 08:07 PM   #4
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Yes, for the same reason. Water is still sitting against a flapper seal, just in a different place. It may look like a residential toilet from the business end, but behind the scenes it's much different.
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Old 09-16-2021, 08:11 AM   #5
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Depends on where you live, I put anti-freeze down it to keep the seals hydrated.
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Old 09-16-2021, 07:14 PM   #6
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Macerator toilets do not have any seals to dry out. Put antifreeze into the water pipes and flush it a couple of times to fill the throat with antifreeze. Water flows through the throat just like a standard home stool. The whole throat is rubber, so I don't think you'll have any problem if you didn't do anything, but it's good peace of mind.
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Old 09-16-2021, 07:38 PM   #7
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Macerator toilets do not have any seals to dry out. Put antifreeze into the water pipes and flush it a couple of times to fill the throat with antifreeze. Water flows through the throat just like a standard home stool. The whole throat is rubber, so I don't think you'll have any problem if you didn't do anything, but it's good peace of mind.
The part #6 must remain wet in order to continue to properly work. This is technically a valve that seals when no flow is taking place.Click image for larger version

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Old 09-16-2021, 09:06 PM   #8
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That appears to be a 1 1/2" duck bill valve placed there to prevent any back flow of black tank water back in to the stool. As you say, the valve closes when there is no water flow taking place. The only time water flow is taking place is when the macerator pump is running and pumping water over the top of the discharge tube. Just having water/antifreeze set in the stool provides no water to this valve. It could dry out and stick shut while setting over the winter months. Even if this happens, the pump will easily open the stuck valve in the spring with a flush.
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Old 09-16-2021, 09:16 PM   #9
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That duck bill is on downstream side of discharge hose and does not hold water etc

Water will only be on toilet bowl side of pump/discharge hose up to top of loop on hose...after that all water drains down

Winter storage...pour some anti-freeze into toilet...water off
Flush toilet then add a little bit more anti-freeze
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Old 09-16-2021, 09:40 PM   #10
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If duck bill is typically dry, then what prevents gasses from coming thru? Sounds like the water I leave in is only insulating the gasses and not lubricating the seals as I thought.
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Old 09-17-2021, 09:35 AM   #11
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If duck bill is typically dry, then what prevents gasses from coming thru? Sounds like the water I leave in is only insulating the gasses and not lubricating the seals as I thought.
The design of the duck bill......'lips' close preventing odor/gasses from coming back from black tank
It is a 'mechanical sea;'......not a water vapor like the water in bowl covering the seal (rv gravity toilet)

AT the top of the discharge hose loop is the anti-siphon vacumm breaker device
Closes when pump runs/flow goes thru discharge hose
Opens after pump stops/flows stops ---when it opens water drains out of discharge hose and then duck bill closes
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Old 09-17-2021, 09:58 AM   #12
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I am familiar with the duck bills. I have never seen one that was air tight for long. Maybe this design is better, but for me, keeping water in the bowl just makes sense.



I don't ever need to winterize, and my RV is used very often, so that may be the difference.
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