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Old 07-16-2016, 06:56 AM   #15
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My toilet has a mechanical flapper the keeps water in the bowl and hopefully overflow waste out. They are not the same as a residential toilet, or am I missing something.
That seal is only so tight. Plus you might not know till you hit the flusher and some comes up.
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Old 07-16-2016, 07:10 AM   #16
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Put a twist-on sewer dump valve on the common? sewer drain. Leave it closed. Open the black water and the gray water drains. Problem solved - the gray water will enter the black tank and both tanks will reach the same level. To drain, attach your hose and open the twist-on valve. Of course you must have a "common" drain point.
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Old 07-16-2016, 11:44 AM   #17
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Trimacon-
Point- you can always drain the grey water somewhere safe. The kitchen sink is one of the major grey water sources and if it fills up the black tank you can't dump it in the grass like we used to do in out old Pace Arrow
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Old 07-17-2016, 12:54 PM   #18
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Put a twist-on sewer dump valve on the common? sewer drain. Leave it closed. Open the black water and the gray water drains. Problem solved - the gray water will enter the black tank and both tanks will reach the same level. To drain, attach your hose and open the twist-on valve. Of course you must have a "common" drain point.
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Old 07-17-2016, 01:48 PM   #19
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Trimacon-
Point- you can always drain the grey water somewhere safe. The kitchen sink is one of the major grey water sources and if it fills up the black tank you can't dump it in the grass like we used to do in out old Pace Arrow
Definitely not allowed in many places. :(
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Old 07-17-2016, 01:54 PM   #20
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Ditto. I'm constantly draining our grey tank and cursing my nearly empty black tank not available to share some of the waste load and reduce the number of dump cycles required of my present setup.

The more water you get into your black tank the better, most people do not put enough in the toilet and that is a major cause of problems.

You should be checking your tank levels periodically so there is no reason that your tank will back up anywhere much less into the sink or toilet, unless you just don't check them.
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Old 07-17-2016, 02:04 PM   #21
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why would it be a 'disaster'?
our gray tank fills much quick than our black tank, I wish our kitchen drained into the black tank like yours...
and yes, for many manufacturers, and different floor plans, it is normal
That is a good question.
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Old 07-17-2016, 02:19 PM   #22
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Trimacon-
Point- you can always drain the grey water somewhere safe. The kitchen sink is one of the major grey water sources and if it fills up the black tank you can't dump it in the grass like we used to do in out old Pace Arrow
i agree, that would be a deal breaker for me
my second rv had bathroon sink drain into black, filled it much faster and required more frequent dumping when dry camping or water only hook up camping
my latest rv I checked before purchase to be sure black was black and grey was grey

live and learn.....
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Old 07-18-2016, 06:27 AM   #23
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Put a twist-on sewer dump valve on the common? sewer drain. Leave it closed. Open the black water and the gray water drains. Problem solved - the gray water will enter the black tank and both tanks will reach the same level. To drain, attach your hose and open the twist-on valve. Of course you must have a "common" drain point.
Catfish
This would 'contaminate' your gray water though and you wold want to be sure to fully flush it and maybe sanitize it well if you ever dump the grey in the grass/drainage.
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Old 07-18-2016, 12:53 PM   #24
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The more water you get into your black tank the better, most people do not put enough in the toilet and that is a major cause of problems.

You should be checking your tank levels periodically so there is no reason that your tank will back up anywhere much less into the sink or toilet, unless you just don't check them.
Our 98' Seabreeze is setup like this. The kitchen sink drains into the black water tank. After we figured this out, I think it's a good idea. As posted here, many people do not get enough water in the black water tank if it is isolated and could cause clogging upon opening the valve. The DW uses one of those little scrubber things that holds dish soap in the handle. She now uses very little water doing the dishes. When boon docking, she cam wash dishes in a large plastic bowel inside the sink and where allowed, dump out the soapy water outside. That way, only the water from hand washing and dish rinsing adds to the black tank level. You just have to be more conservative on alot of things when boon docking or dry camping.
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