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Old 06-29-2014, 02:09 PM   #1
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Holding tanks

This is our first time out with the Redwood. I've learned here that the tank gauges are not accurate and that when full, the grey will back up into shower. How do you really know when the galley is full? Will kitchen sink back up like the shower does? I'm showing grey 1 is full, that is the galley, correct? Thanks in advance for helping me with my confusion.
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Old 06-29-2014, 02:18 PM   #2
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Just to add to the confusion, Brenko on this thread

http://www.redwoodowners.com/forums/...9989#post29989

said his 38GK shower drains to the galley tank

You might ask around if your dealer has a drawing of the plumbing. There are a few model drawings already floating around Redwood sites.
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Old 06-29-2014, 02:35 PM   #3
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Brad, I saw that but didn't want to muddle his thread with mine. I want to wait as long as possible to dump. I should add that we do not have sewer here and to get parked I used a little of the campsite across the road (which is now occupied) and hope they are weekend campers and will be gone Monday.
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Old 06-29-2014, 02:42 PM   #4
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The never ending discussion on grey water...
Fact 1... no now really knows which is Grey 1 or Grey 2, then seem to be different in individual rigs? Is Grey 1 the Galley tank or is it Grey 2?
Fact 2... no one really knows which drains are plumbed into which grey tank, especially the shower?
Fact 3... the indicators are not accurate, it is conceivable that a totally empty tank could show full on the indicator panel [especially true on black tank]?
Fact 4... no now really knows which drain will "bubble", that is which drain will indicate a full tank. It could be the kitchen sink, the bathroom sink or the shower. could even be multiple drains???
Fact 5... using a twist-0n valve on the dump tube and opening the grey valves will allow sharing the grey tanks thus giving you a true 90 gallons of capacity.

The bottom line... you have to use your own system to get to know how it operates. Those of us who live in our rigs and those who use them frequently have our own ways of operating. Some share tanks with the external screw-on valve, some rely on the indicators, some leave the grey tanks open while connected, others don't. Every one of us will choose our own MO for grey water dumping.

Then there is the never ending discussion on black tank cleaning...
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Old 06-29-2014, 03:30 PM   #5
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I would recommend getting the external valve which only takes seconds to put on and adds a safety margin as well. By spending the $15, you can use all of the 90 gallons of grey which allows for a good capacity. My wife and I can go for 4-5 days of freely using the water without any issues at all.

We've all experienced leaking valves before. On my Redwood the galley valve for some reason leaked a little for a couple of weeks before i got all the food particles out of the valve. While that valve was leaking, the extra twist on valve that I installed, prevented a problem. The older Redwoods like mine, has a sewer boom which makes installing the valve a little troublesome but well worth the time and money.
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Old 06-29-2014, 03:41 PM   #6
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Dave or Chuck, would you please explain how and or what this valve does and where it is attached? I know there was some discussion about this valve recently, but due to the excitement of getting ready to pick up our coach, it slipped my mind. Thanks.
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Old 06-29-2014, 03:43 PM   #7
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Steve & Linda,
I did some testing yesterday to determine the plumbing system on my rig. I emptied all of the tanks, then one by one, I dumped 5 gallons into each drain and dumped between each fill to know which tank was tied to each. I also ran a load of laundry to verify it as well. Here are the results on my 2014 38GK:

Indicators:
Grey = Gray1
Galley = Gray 2

Source for grey water:
Washer
Lav Sink
Bedroom Sink

Source for galley water:
Shower
Kitchen sink

The black tank is mounted above a grey tank. I just had it replaced as the spin weld failed on the vent pipe, top of the tank. (Tank removal alone was 9 hours labor).

I, like many others use a valve at the exit point. It has been suggested by others that opening the galley and grey valve and closing the valve at the exit point will allow all drains to equalize thus using the total 90 gallon waste water capacity. This should be true if both the gray tanks are at somewhat the same level horizontally, a fact that I have yet to verify. With the advent of the newer drop frames, this popular solution didn't work on some manufactures.

Bottom line is that it is ridiculous to have the shower plumbed to the galley tank. Absent a washer, that means that the only use of the grey water would be the bath sinks...hardly efficient.

I hope to get a plumbing diagram similar to the ones posted on other models.

Ken

PS, My gages at this point are working....Did I say that out loud? Hope not to jinx myself!!
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Old 06-29-2014, 03:58 PM   #8
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Quote:
Originally Posted by Steve & Linda View Post
Dave or Chuck, would you please explain how and or what this valve does and where it is attached? I know there was some discussion about this valve recently, but due to the excitement of getting ready to pick up our coach, it slipped my mind. Thanks.


By putting an additional valve at the end of line (where you connect the sewer hose) you can utilize the entire 90 gallons of grey water capacity. You keep this valve closed and then open the 2 grey valves. When you're ready to dump, you close the 2 grey valves.

After hooking up the sewer hose, open the "new valve". This will empty the standing water that had accumulated in the piping. Then drain your tanks as you normally would.
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Old 06-29-2014, 04:08 PM   #9
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Here is a link to the valve were talking about:

http://valterra.com/product-category...wist-on-valve/

Available at most Rv parts stores.

Ken
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Old 06-29-2014, 04:13 PM   #10
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Good explanation Dave, you're right on!!

One note... BEFORE dumping the Black water tank you SHOULD [for me MUST] close the two Grey tank valves, then open the added valve at the end of the line, then open the Black valve to empty the black tank. Once the Black tank is empty I rinse the black tank throughly [at least twice], then close the Black valve and open the two Grey valves and finally close the added valve at the end of the dump tube.

Note... I close the grey valves one day prior to dumping the black tank so I'll have rinse water to flush the lines after dumping the black water.
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