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Old 04-29-2015, 10:30 PM   #1
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2015 38RL - Grey Water Tank Size?

The Galley Grey tank fills up much faster than the Shower Grey tank.

I read the manual but could not find the actual tank size.

Redwoods homepage says "90 Gallons Grey Water".

Does anyone know if they both are 45 Gallons each?
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Old 04-29-2015, 10:44 PM   #2
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They are 45 gallons each. Best way to equalize them is to add a valve at the outlet and then you can close that valve and open both grey valves and they will equalize.
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Old 04-29-2015, 11:08 PM   #3
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Thanks for the fast answer! We have a back flush valve to flush out the grey tanks and the galley tank seems to fill much faster. Most likely just dirty sensors then if they are equal in size.
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Old 04-30-2015, 12:03 AM   #4
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They are 45 gallons each but the way Redwood hooked mine up just doesn't make sense. That's why we purchased the additional slide valve to allow us to open both gray tanks so they will equalize. On my 31SL, all the water from the kitchen and shower go into one tank and only the bathroom sink goes into the other. Doesn't make sense as it takes a long time to fill up the tank with only the bathroom sink and the other one will fill fast with everything else going into it.
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Old 04-30-2015, 02:20 AM   #5
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The 36RL is the same way. The other tank is set up for the Washer Dryer and the bathroom sink. Definitely add the slide valve on the end to equalize the tanks.
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Old 04-30-2015, 04:22 AM   #6
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This method of installing a valve at the sewer exit apparently works on some but not all models. I tried it on my 38gk. The galley tank is mounted below the grey tank. Once the galley tank is full, water backs up and leaks from the ptraps into the belly. Unfortunately it doesn't back fill into the grey tank on my model. I sure wish it did as it would be helpful when boondocking.

Ken
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Old 04-30-2015, 01:00 PM   #7
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Ken,

What model RW do you have???

I am considering this with my 38FL.

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Old 04-30-2015, 01:59 PM   #8
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Quote:
Originally Posted by brenkco View Post
This method of installing a valve at the sewer exit apparently works on some but not all models. I tried it on my 38gk. The galley tank is mounted below the grey tank. Once the galley tank is full, water backs up and leaks from the ptraps into the belly. Unfortunately it doesn't back fill into the grey tank on my model. I sure wish it did as it would be helpful when boondocking.

Ken
Ken, help me out here. In my mind I'm trying to understand why your gray water will not back fill into the gray tank once the galley tank is full. I'm no plumber but your p traps have to be higher than both tanks. If you have both gray tank valves open and the sewer exit valve closed then I would think the gray tank would start to fill before the water can get high enough to get back into the p traps. Maybe it's just too early in the morning to be trying to think this out!
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Old 04-30-2015, 03:08 PM   #9
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Bill & Diana, I have a 2014 38GK. I'd sure give it a try to see if it works for you.

Rick and Mindy,
Not exactly sure why but I tested it a few times with the same results.

I'm really only guessing at the location of the leak as I was not able to actually find it, I just observed the results. Closing the valve at the sewer exit, I let the galley tank fill. The source for our galley tank is the shower, kitchen sink including dishwasher.

When full, it leaked all through the belly pan and on to the ground. My assumption that it was the trap maybe incorrect as I have tested it by filling the galley tank with the galley tank valve closed. This resulted in the water backing up into the shower. I may have not let it sit long enough for it to have leaked in the traps. The only other place it could be leaking is through the vent pipe. My black tank had failed (and was replaced) due to a bad spin weld on the vent pipe. When the black tank was full, it leaked around the vent pipe spin weld and leaked through the belly pan.

I am also assuming that the galley tank is mounted lower than the grey tank. Water going up hill may contribute to the problem. Before the RV's came out with the drop frame, the grey and galley tanks were at the same level, thus the solution of using the end valve and opening both tanks worked. It sure doesn't for my rig.

In any event, when we try to back the galley tank into the grey tank, we have a mess! We really hoped this would work for us too as it's a shame to have a empty grey tank when boon docking!!

Ken
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Old 04-30-2015, 03:39 PM   #10
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Ken, sorry to hear that this system doesn't seem to work for you. I don't want to be repetitive but you don't say that you leave both gray water valves open. I just want to make sure that that is what you are doing. My thought is that if it only leaks when you use the exit valve then the leak is occurring somewhere from the drain line of the tank to the exit valve because you say the tank doesn't leak when you keep the galley valve closed. Have you tried filling the other gray tank while leaving it's valve open and the exit valve closed? That would tell you if the leak is occurring from the gray valve to the exit valve and not from the tank up to the traps. Just trying to think of all possibilities.
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