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 > Gray water to black tank?

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Weldon

Texas

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Posted: 06/07/21 10:06am Link  |  Quote  |  Print  |  Notify Moderator

Recently went to the bathroom and the floor had about an inch of water on it. The bowl was full and would not flush because the tank was full.
Can water from grey tank (shower) get into the black tank?
This never happened before. Had 2 teenage boys with me on this trip and they have no idea what caused the problem. Thoughts?

jdc1

Rescue, Ca

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Posted: 06/07/21 10:22am Link  |  Quote  |  Print  |  Notify Moderator

If they intermixed, then the shower would have been the first to overflow. But, yes, they can mix, if you left both gray and black valves open at the same time.

GizmosMom

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Posted: 06/07/21 10:31am Link  |  Quote  |  Print  |  Notify Moderator

Our sink in the bathroom empties into our black water tank.


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Weldon

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Posted: 06/07/21 11:17am Link  |  Quote  |  Print  |  Notify Moderator

We have 2 grey tanks, one for kitchen and one for shower. 2004 Montana

valhalla360

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Posted: 06/07/21 11:20am Link  |  Quote  |  Print  |  Notify Moderator

A lot of RVs they come together at the main dump location.

If you left the cap on and opened both valves, water will flow from the one that is more full to the one that is less full. Not a good thing when you go to drain as there will be a huge rush of water when you pull the cap off before you can get the hose on.

But as mentioned, the shower is more likely to flood before the toilet as the shower drain is lower.


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wildtoad

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Posted: 06/07/21 12:38pm Link  |  Quote  |  Print  |  Notify Moderator

Quite common for lavatory sink to be plumbed to the black tank to better assure sufficient water to break down solids and force them out when drain is opened.


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Old-Biscuit

Verde Valley

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Posted: 06/07/21 06:02pm Link  |  Quote  |  Print  |  Notify Moderator

Had 2 teenage boys with me on this trip and they have no idea what caused the problem.


That sums it up right there.........


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JaxDad

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Posted: 06/08/21 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

Weldon wrote:

Recently went to the bathroom and the floor had about an inch of water on it.

Had 2 teenage boys with me on this trip …….


Thoughts?



Weldon wrote:

We have 2 grey tanks, one for kitchen and one for shower.


I think you answered your own question.

Weldon

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Posted: 06/09/21 11:30am Link  |  Quote  |  Print  |  Notify Moderator

The kitchen or galley tank drains separately from the other two.

Super_Dave

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Posted: 06/09/21 11:50am Link  |  Quote  |  Print  |  Notify Moderator

If all valves are closed, where would be the first place that the black tank overflowed?


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