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Thread: Grey Tanks 1 & 2
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01-16-2018, 07:24 AM #11
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I found it easy to identify, the one that fills up quicker is usually the bathroom. GD told me the kitchen sink is the only thing going into the other one. Both the same size. external gate valve helps quite a bit.
Ron & Sue
2016 Reflection 337 RLS
2011 Chevy 2500 HD Duramax
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01-16-2018, 07:45 AM #12
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U.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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01-16-2018, 02:51 PM #13
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Got a great laugh at this one.
We haven't tried the trick opening both grey valves with the add on valve closed. I feel like I will need a big warning label on the external valve first for myself to close off the gray valves prior to opening that black one. Knowing myself, in a rush I would forget and then I would get mixing of black and grey.2019 2800BH
BlueOx Swaypro BXW1500
2017 Expedition EL XLT w/heavy duty tow package w/ Michelin Defender LTX LT275/65/18
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01-19-2018, 03:07 PM #14
I hadn’t thought about the technique Second Chance described-that is a great idea. We have the Valtera external gate valve on our already. I’ll try that this season. Thanks!
Dave and Anne
2015 Ford F350 XLT 6.7l 3.55 Crew Cab/SB
2016 Grand Design Reflection 337RLS w/King Size Bed and Dual A/C
2 Golden Retrievers - Ivy 6 yrs and Ruby 2 yrs.
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01-20-2018, 05:56 PM #15
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So if I understand Second Chance's idea, the external gate valve goes on at the hose connection (the twist-on Valterra valve) and then with both grey tanks open the grey water flows into the designed tank and then backfeeds to the other tank because the tank valves are open and the external is closed?
My specs say I have 75 gallons total grey water for the 2018 303RLS. I assume that is both tanks combined. Does anyone know the size of each tank? 37 1/2 gallons each or is the bathroom larger?
ThanksAllyn & Sue
2018 Reflection 303RLS
2016 F350 Lariat PS 6.7
Andersen Ultimate Connection 2
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01-20-2018, 07:07 PM #16
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U.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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09-13-2019, 12:56 PM #17
Eventually
Finally after years of use I finally labeled the gray tanks on our 337.
G1 = bath - middle pull
G2 = kitchen - front pullCurrent;
2017 Reflection 337LRS 5th with 2016 Silverado LTX 3500HD Duramax
2019 Reflection 367BHS 5th permanent in RV park
Past;
30' TH TT Weekend Warrior, 36' TH 5th Weekend Warrior (both with Ford F250 diesel)
26' TT Shadow Cruiser, 30' TT Cougar (both with Ram 1500 5.7L Hemi)
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09-03-2021, 06:26 AM #18
Hey Rob. Picking up on this old thread and would like your opinion. I did the same as far as installing an external gate valve on my GD. When I dump my tanks I dump the black first of course and when its finished I close the external gate valve and open one of the grey tanks while leaving the black tank valve open to allow the grey water to backfill into the black tank and dump it again and then repeat this process with the second grey tank, essentially using the grey water to backflush the black tank. I recognize I might be at risk of having black water backflow into my grey tanks but I think the risk is pretty low. I could close the grey tank valves before I dump the black tank a 2nd & 3rd time....but I don't currently.
Whatd'yathink?2020 Chev Silverado 2500 (6.0L Gas)
2021 Reflection 303RLS
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09-03-2021, 06:38 AM #19
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I think that, with a flush system in the black tank, that's unnecessary extra work and cycles on the valves. As for cross-contamination, I just had a conversation with my then-next-door-neighbor on Monday. He was in a large DP coach and the topic was the electric-only site we have to move to today. He said that some of the high end motorhomes have everything going into one tank, anyway (of course, with a built-in macerator so they can dump under suboptimal conditions, too). Everything in one tank doesn't seem to be an issue there. Many of our GD rigs, however, have a smaller pipe and gate valve on the kitchen gray tank than on the bathroom tank. I would be concerned about solids getting in the small valve and outlet and clogging that up.
RobU.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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