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Old 08-01-2020, 11:17 AM   #1
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Leaving both grey and black tanks open on 2020 Discovery XLE

I read somewhere, that since we have 2 macerating toilets with double p trap type plumbing on the Discovery's you can leave both the grey and black tanks open without any odors getting into the coach. So I have been testing that out for the past 3 weeks and it seems to be true. Anyone else do, read or heard this?
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Old 08-01-2020, 11:20 AM   #2
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With P traps it seems that would make sense.
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Old 08-01-2020, 01:00 PM   #3
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Leaving both grey and black tanks open on 2020 Discovery XLE

P traps have nothing to do with leaving valves open. If you leave the black open all of the liquids drain out leaving poop mounds and tissue clods which is not so good. You can leave grey open but you need my opinion about a half a tank of grey to flush out hose after dumping black.
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Old 08-01-2020, 01:19 PM   #4
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As has already been stated - P traps have nothing to do with.

With the Black tank valve open you are allowing the liquid portion of your waste to drain out leaving the solids behind which can really solidify within 24 hours making it almost impossible to get them out of the tank.

Over the years I have left the gray tank open until the night before we were planning to depart. With it about half full I would dump the black tank; flush it and then dump the dray to flush out the hose.

If you leave the valves open you are also inviting uninvited guests into your unit.

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Old 08-01-2020, 02:11 PM   #5
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Not not open black valve until the black tank is 3/4 full. If you just leave it open, you will wind up with accumulated solids.
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Old 08-01-2020, 02:46 PM   #6
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With both toilets macerating all the waste... grinding everything and adding water so everything turns to a liquid form and jet flushing it out. Nothing is left to dry and pile up. Plus the ratio of liquid being flushed verses solid waste and toilet paper being flushed is about 5 to 1 there are no solids left to build up no piles or TP residue to sit and dry out. I also keep the blank tank flush system hooked up to rinse every week or when needed. The dual p traps keep any sewer gases from entering the coach. If I am traveling and doing overnight stops I let the tank fill and use happy camper to break it down even further. When I leave I close the grey tank the night before but that only helps clean/rinse the hoses, plus washing clothes and dishes keeps it rinsed as well. I use the black tank flush to clean all the residue every move day when the hoses are being used. Flush and Back Flush again and again till it's clear water coming out. I don't see it being a problem.
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Old 08-01-2020, 04:42 PM   #7
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With both toilets macerating all the waste... grinding everything and adding water so everything turns to a liquid form and jet flushing it out. Nothing is left to dry and pile up. Plus the ratio of liquid being flushed verses solid waste and toilet paper being flushed is about 5 to 1 there are no solids left to build up no piles or TP residue to sit and dry out. I also keep the blank tank flush system hooked up to rinse every week or when needed. The dual p traps keep any sewer gases from entering the coach. If I am traveling and doing overnight stops I let the tank fill and use happy camper to break it down even further. When I leave I close the grey tank the night before but that only helps clean/rinse the hoses, plus washing clothes and dishes keeps it rinsed as well. I use the black tank flush to clean all the residue every move day when the hoses are being used. Flush and Back Flush again and again till it's clear water coming out. I don't see it being a problem.


If you know the answer you want why did you start post? I donít think a half a gallon of ground up poop and water will even make it thru the tank to the end of a 10 ft sewer hose.
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Old 08-02-2020, 10:15 AM   #8
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Dave, I have the same coach as you... However, you should listen to what the others are saying... Not sure if you have any clear sewer fittings with your set up or not. If not, get some. Keep your black tank closed and let it fill up, then dump while keeping an eye on the clear fittings. You will see that while it drains, clumps of wet TP and other effluent flows through the hose toward the end of the dump.

Its easy to think that the toilet is grinding up all of the "stuff" into nothing but liquid, but what you end up having is a "wet slurry" of TP (and other things) that still travels in clumps. The shape of the tanks on our coaches will ensure that those clumps will rest on the bottom of the tank with no really good way of being rinsed out.

IIRC you haven't had your coach much longer than me, so you may be in good shape now. Several months down the road as this "slurry" accumulates, you are going to be back on here asking how to disolve the solids in the bottom of your tank...
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Old 08-02-2020, 10:19 AM   #9
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Dave, I have the same coach as you... However, you should listen to what the others are saying... Not sure if you have any clear sewer fittings with your set up or not. If not, get some. Keep your black tank closed and let it fill up, then dump while keeping an eye on the clear fittings. You will see that while it drains, clumps of wet TP and other effluent flows through the hose toward the end of the dump.

Its easy to think that the toilet is grinding up all of the "stuff" into nothing but liquid, but what you end up having is a "wet slurry" of TP (and other things) that still travels in clumps. The shape of the tanks on our coaches will ensure that those clumps will rest on the bottom of the tank with no really good way of being rinsed out.

IIRC you haven't had your coach much longer than me, so you may be in good shape now. Several months down the road as this "slurry" accumulates, you are going to be back on here asking how to disolve the solids in the bottom of your tank...
I certainly hope he takes your advice.
jt
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