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Old 01-12-2016, 12:58 PM   #1
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Black & gray tanks

Maybe I'm overlooking an obvious, but why wouldn't an RV manufacturer design an RV where the gray water flushes thru the black water tank.
If the gray tank sat above the black water, you could get a much better black flush.
Please feel free to point out any obvious issues I may have overlooked.


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Old 01-12-2016, 01:03 PM   #2
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Probably if the black water tank overflowed it would backup into the gray. And add complexity.
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Old 01-12-2016, 01:05 PM   #3
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I always keep my grey valve open when camping with full hookups and only pull the black when it's full. If the grey ran through the black, I'd be dumping much more often. I will say that with the black tank flush installed on our Berks, it cleans the tank really good! I use a clear sewer connector and flush the tank for a good 20 minutes or so and the water comes out crystal clear.

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Old 01-12-2016, 01:06 PM   #4
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I have to drain the gray twice before the black needs to be drained.
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Old 01-12-2016, 01:10 PM   #5
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Quote:
Originally Posted by caper View Post
I have to drain the gray twice before the black needs to be drained.

A good reason for a setup like this


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Old 01-12-2016, 01:23 PM   #6
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I think I understand what you are wanting and I agree. What I do is when my gray is full I dump my BT. As it finishes and the hose is still full I pull the gray and count to ten. This pushes a good amount of gray water into the BT I then shut the gray off and flush the BT. Then empty the gray. It seems like all that gray water would be a good way to flush the BT. This only works if I remember to close the GT so it fills up as I do leave the gray open all the time.
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Old 01-12-2016, 01:39 PM   #7
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Phil,

I do the same thing, except leaving the gray tank open. I'm currently wintering in Colorado so that wouldn't work here lol.


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Old 01-12-2016, 02:16 PM   #8
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Quote:
Originally Posted by jegstrup View Post
Maybe I'm overlooking an obvious, but why wouldn't an RV manufacturer design an RV where the gray water flushes thru the black water tank.
If the gray tank sat above the black water, you could get a much better black flush.
Please feel free to point out any obvious issues I may have overlooked.
Quote:
Originally Posted by jegstrup View Post
A good reason for a setup like this
Another reason has to do with plumbing mechanics. It is difficult to put the gray tank "above" the black tank - they are both seated on the frame at the same level, so the natural exit point for each tank would be the low point.

All Berks have a excellent Black tank flush system and, if you are practicing the GEO method you should have zero problems with your black tank--even when using comfy 2 ply household toilet paper (like Northern or Charmin) but NOT moist wipes (those need to go in the trash).
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Old 01-12-2016, 02:38 PM   #9
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My flush system hasn't worked since the first time I tried it. Pressure builds up in the line then I hear spraying water, the. The water starts running out the top of the storage compartment next to it. I've tried to take panels off to see where this is happening but no luck yet.
But, the flush system just used more water and we already have a full tank of soapy water that would be a good flush.


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Old 01-12-2016, 04:27 PM   #10
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Quote:
Originally Posted by jegstrup View Post
My flush system hasn't worked since the first time I tried it. Pressure builds up in the line then I hear spraying water, the. The water starts running out the top of the storage compartment next to it. I've tried to take panels off to see where this is happening but no luck yet.
But, the flush system just used more water and we already have a full tank of soapy water that would be a good flush.


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Something is *NOT* right with your black tank flush. But first, to clarify, when you turn on the black tank rinse your black tank valve is *open* correct? If you keep that baby closed "bad things happen™"

Don't ask me how I know....
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