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01-13-2016, 10:58 AM
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#1
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Senior Member
Join Date: May 2015
Location: Issaquah/Grand Coulee, WA
Posts: 1,073
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Does bathroom sink drain to gray or black tank?
Came across someone else's thread where they reported that a black tank issue erupted from their toilet AND sink.
Are they typically both going into the black tank?
Just need to know, so I can keep a better eye on my sensor levels while out and about.
__________________
2015 24' Rockwood UltraLite 2304DS w/Equal-I-Zer 4-Point 1000lb sway control.
2014 39' Montana 3402RL (full-time)
Towing with 2018 Ram 2500 and 2014 Ecodiesel Grand Cherokee
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01-13-2016, 11:12 AM
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#2
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Senior Member
Winnebago Owners Club
Join Date: Nov 2014
Location: Dayton, OH
Posts: 1,136
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I think it depends on your coach. My old Winnie was set up that the toilet and Lavatory both drained to the black tank and the kitchen sink and shower drained to the Grey tank.
I think in my Storm the Lav, Kit Sink and Shower drain to the grey tank and the toilet drains to the black tank, but I am still figuring it out.
__________________
2007 Winnebago Journey 36SG and 13 Honda CRV Toad,
e-Trailer XHD Towbar (Demco), Blue Ox baseplate, SMI Stay N Play brakes
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01-13-2016, 11:13 AM
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#3
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Senior Member
Join Date: Feb 2013
Location: Graham, WA
Posts: 773
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Our bath sink drains into the black tank. Shower and kitchen sink go to the gray.
I think the logic is that gray tank typically fill first and also to ensure that the black tank has sufficient water to drain properly.
If you're draining the tanks, drain both until empty then shut the valves. Run water into the sink for a few minutes then go pull the drain valves one at a time. Most likely the back will have water to drain.
__________________
2006 Gulfstream Friendship G7, Cat C7 and Allison 6 spd
Honda VTX and Cruiser Lift on the back
Blue Ox Aladdin, Brake Buddy, 2019 Chevy Blazer RS toad
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01-13-2016, 11:13 AM
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#4
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Senior Member
Winnebago Owners Club
Join Date: Jan 2014
Posts: 539
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Never heard of it. Only the toilet goes in to the black tank and the sinks/shower are to the grey tank on mosty all trailers and coaches. Unless someone got the plumbing wrong at the manufacturer. Could happen though...
__________________
07 Meridian 34H 350 Cat
2010 Subaru Forester Tow
Home Port is Kingman,Az
KA7UYZ NRA Endowment Member Retired Fire Service
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01-13-2016, 11:42 AM
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#5
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Senior Member
Join Date: Nov 2015
Posts: 26,843
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Quote:
Originally Posted by dnystrom
Never heard of it. Only the toilet goes in to the black tank and the sinks/shower are to the grey tank on mosty all trailers and coaches. Unless someone got the plumbing wrong at the manufacturer. Could happen though...
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Not as uncommon as you think
Plumbing bathroom sink and even shower drain to black tank happens by design.
Lay out of trailer...waste tanks......plumbing restrictions
And the idea that more water to black tank is a good thing
Trailer mfgs (unlike many MH mfgs) rarely have actual schematics so one has to learn by default.
With empty waste tanks........run bathroom sink and then ID which tank it drain to by opening drain valve one at a time.
(Repeat with shower--sometimes shower and bathroom sink use same drain line, sometimes they have individual drain lines)
It wasn't that many years ago RVs only had 1 waste tank.
Looks like we are slowly going back to that
Which is fine by me. I have an 'extra' dump valve on main common header and can tie ALL three waste tanks together (Black/grey/galley) in any combination. Greatly increases capacity. Plus I can move the grey/galley over to black after dumping and give black a big soapy rinse/flush
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01-13-2016, 01:05 PM
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#6
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Senior Member
Join Date: May 2015
Location: Issaquah/Grand Coulee, WA
Posts: 1,073
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I guess I can check it next time I am out there. Just open gray line and turn on sink. I am pretty sure the shower is hooked to gray, because it fills up fast after two or three showers.
__________________
2015 24' Rockwood UltraLite 2304DS w/Equal-I-Zer 4-Point 1000lb sway control.
2014 39' Montana 3402RL (full-time)
Towing with 2018 Ram 2500 and 2014 Ecodiesel Grand Cherokee
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01-13-2016, 01:42 PM
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#7
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Sadly the answer to your question is "YES" it goes to either the black or Gray tank depending on who plumbed your RV.
It **SHOULD** go to either Gray or Wash (if you have 3 tanks)
Description of the 3 tanks:
Black: Well you know what goes into the Black tank. So I won't describe it.
WASH,, Bathroom sinks, Shower, Laundry but NOT THE KITCHEN SINK (food particles)
Gray, Kitchen sink and optionally Bathroom Sinks and shower
If you have a washing machine, it can also go into either Gray or Wash
Why the 3 classes.
In no place can you legally dump Black on the ground, MUST go into a proper sewer system (NOTE: If you have like 100 acres of farm and dump in the back 40,,,, Likely will have no problems but it is still illegal)
Gray,, Some places allow it do just be dumped.. Some have special "Gray dumps" Some require it go into a proper sewer.
Wash. EVEN more places allow it to be dumped on the ground... Or in the special GRAY dumps.. But again some places require it to be put in a sewer.
So that's why 3 tanks,, Where you can dump depends on the tank.
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Home is where I park it!
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01-13-2016, 01:55 PM
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#8
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Our first coach, a Safari Trek, had the bath sink plumbed to the black tank. Our subsequent PA and Phaeton do not.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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01-13-2016, 02:19 PM
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#9
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Senior Member
Winnebago Owners Club
Join Date: Dec 2015
Location: Jacksonville, Fl
Posts: 3,542
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If your toilet is directly above the black tank, so that when you flush you can see down into the tank, you could easily test this by turning off your fresh water pump, hold down the flush pedal on the toilet so that you can see into the tank, then pour water into the bathroom sink (naturally you'll need to pour this from a bottle or something, since the pump is turned off). If you can see the water moving in the tank then the sink drains into the black tank.
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01-13-2016, 02:23 PM
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#10
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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Current unit has sink and toilet into the black tank. Handy that if the black tank gets full the sink gurgles before the toilet over flows.
It is very easy to make an argument that the shower, toilet and bathroom sink should go to the same tank due to fecal contamination. At least the bathroom sink and toilet should go to the black tank for that reason.
The low flush toilets do not use enough water to effectively keep things as liquid as we would like so the need added water either as part of the load or as tank flush afterwards. Folks get so hung up on maximizing use that they ignore the down side. That does not make it go away.
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01-13-2016, 02:27 PM
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#11
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Junior Member
Join Date: Jan 2016
Posts: 1
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Sink/shower water goes into gray water tank.
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01-13-2016, 02:44 PM
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#12
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Senior Member
Join Date: Nov 2015
Posts: 26,843
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Quote:
Originally Posted by mikeebraun
Sink/shower water goes into gray water tank.
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For your RV.....and same for mine
But that doesn't mean same for OPs RV
1 small black tank no grey
1 large tank for black/grey
2 waste tanks--black & grey
3 waste tanks---black, grey, galley
1 fresh water tank
2 fresh water tanks
Seen them ALL
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