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03-13-2017, 07:04 AM
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#1
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Weekend Camper
Join Date: Jan 2017
Location: FL
Posts: 68
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Black Tank Flush?
Out of curiosity...my 291RK has a flush valve for the black tank. How does this actually work? Is there actually some sort of high-pressure spray nozzle inside the tank that blasts the sides, or does it just dump extra water into the tank without you having to fill from the toilet?
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03-13-2017, 09:00 AM
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#2
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Full Time Camper
Join Date: Aug 2012
Location: Belle River , Ontario
Posts: 1,753
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first off , dont put the tap(hose) on full ,just enough to put water thru,maybe 1/2 way. Mine leaks a bit at the aeroator (under the bath sink) if to much pressure.
It is just a nozzle in the upper portion of the tank on one side. There is an aerator between the outside fitting and the tank ,usually under the sink. This part is never checked a the factory or at most dealers and will probably have 2 loose hose connections. There is an arrow on it that should be facing the direction of water flow,some have been installed backwards.Look under the sink and tighten .Watch under there while someone turns the water on .
some say to only use when valve is open ,others do when valve is closed. If vent is hooked up correctly ,either way will be ok,as the vent will expel air when water is filling.
If you are at a full hookup site then it will work good to flush tank when you dump ,but if you are at a dump station ,there are alot of stations that do not have a hose fitting so a 5 gal water container dumped into the toilet bowl is better,and quicker. fill the jug up before you get to the dump station to save time.
__________________
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
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03-13-2017, 09:02 AM
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#3
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Full Time Camper
Join Date: Apr 2011
Location: Pennsylvania
Posts: 2,769
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Lp
Before you are ready to dump your black water tank using the flush, the first thing you want to do is to purchase a clear plastic extension pipe that attaches between the 3 inch camper waste pipe and your flexible dump pipe...You will use it to determine how dirty or clear the black tank is as you flush...This clear pipe can be bought art any RV store...
1) attach the campground fresh water to the flush, open the black water dump valve and turn on the flush at the same time...
2) watch the waste water through the piece of clear plastic pipe, when the black water slows down close the black water dump valve while letting the flush run for a couple of minutes, then reopen the black water valve...
3) repeat this process until the water coming out of the black tank, as seen through the clear plastic pipe, is fairly clear...
WARNING:: O NOT walk away from this process until you are finished dumping...If you start something else and forget you are dumping you could flood your camper...I've seen it done NOT pretty...
__________________
Rosie & Tommy
Coatesville Pa.
2017 Ford F350 Lariat Power Stoke DW
2022 Alliance Avenue 32RLS
In God We Trust
A proud member of the one percent...Semper Fi
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03-13-2017, 10:55 AM
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#4
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Weekend Camper
Join Date: Jan 2017
Location: FL
Posts: 68
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Thanks guys. I do understand what the process is, I was just curious from a functional standpoint how that flush valve works, e.g. is it just adding water into the black tank, or is there actually a spray valve that pressurizes the water and blasts into the black tank to clean the walls off?
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03-13-2017, 12:01 PM
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#5
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Full Time Camper
Join Date: Aug 2012
Location: Belle River , Ontario
Posts: 1,753
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As I mentioned in my long winded info, just a nozzle pointing at the other wall.
__________________
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
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03-13-2017, 12:25 PM
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#6
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Weekend Camper
Join Date: Jan 2017
Location: FL
Posts: 68
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Quote:
Originally Posted by harley
As I mentioned in my long winded info, just a nozzle pointing at the other wall.
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Got it, thanks Harley!
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03-13-2017, 03:21 PM
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#7
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Full Time Camper
Join Date: Apr 2011
Location: Pennsylvania
Posts: 2,769
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Quote:
Originally Posted by lp722
Thanks guys. I do understand what the process is, I was just curious from a functional standpoint how that flush valve works, e.g. is it just adding water into the black tank, or is there actually a spray valve that pressurizes the water and blasts into the black tank to clean the walls off?
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Lp
OOOPPS thought you were asking how to use the flush...
__________________
Rosie & Tommy
Coatesville Pa.
2017 Ford F350 Lariat Power Stoke DW
2022 Alliance Avenue 32RLS
In God We Trust
A proud member of the one percent...Semper Fi
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03-17-2017, 09:42 PM
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#8
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Weekend Camper
Join Date: Jan 2015
Location: Wisconsin
Posts: 80
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I have the black tank flush on my unit and it does work very well. After the initial drain of the tank, I close the valve and use the flush to fill the tank. I usually have the wife go inside and use the indicator panel to tell me when the tank is 2/3 full. I will then re-open the black tank and drain. I repeat this process probably 2-3 times before closing everything up. Keeps everything clean and clog-free.
It baffles me why so many dump stations have a silly "J" nozzle attachment thingy that is useless when you have an external flush connection. Some locations will remove the set screw from the nozzle so that you can remove it and attach your own hose for the black tank flush. Word of the wise....do not use your fresh water hose for this process. Get a separate 20' section of hose dedicated for black tank flushing.
__________________
2014 Ram 2500HD CTD MegaCab-Big Horn Edition
2016 ST Reserve 26RB
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03-18-2017, 11:17 AM
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#9
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Gone Traveling
Join Date: Feb 2016
Location: Texas
Posts: 1,392
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I would NEVER EVER trust any of my tanks to read any where near accurate, especially while filling the black tank. Filling the black for 3-5 minutes on mine is more than enough to sufficiently clean it. After the initial dump I squirt a healthy squirt of some cheapo dish soap down the toilet & then rinse/dump a few time til clear.
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03-22-2017, 06:02 PM
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#10
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Family Vacation Member
Join Date: Nov 2012
Location: Virginia
Posts: 105
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The manual for my ST32BH advised me to run the faucet for the outside sink while using the flush. This is also a benefit because when I see the water in the sink back up I know its full.
__________________
Dustin
Nokesville VA
2008 F350 Super Duty 6.4
2014 Sunset Trail 32bh
"I work so I can CAMP, I camp to get away from WORK"
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03-22-2017, 06:32 PM
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#11
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Site Team
Join Date: Dec 2007
Location: WI.
Posts: 9,161
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Quote:
Originally Posted by dminer04
The manual for my ST32BH advised me to run the faucet for the outside sink while using the flush. This is also a benefit because when I see the water in the sink back up I know its full.
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You must have one of the few that CR plumbed into the holding tank. Thats great!
But I think you should count your self lucky and fortunate to have thay feature.
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03-22-2017, 06:34 PM
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#12
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Family Vacation Member
Join Date: Nov 2012
Location: Virginia
Posts: 105
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So all the sunsets don't do that? Where does yours drain?
__________________
Dustin
Nokesville VA
2008 F350 Super Duty 6.4
2014 Sunset Trail 32bh
"I work so I can CAMP, I camp to get away from WORK"
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03-22-2017, 06:42 PM
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#13
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Site Team
Join Date: Dec 2007
Location: WI.
Posts: 9,161
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03-22-2017, 07:16 PM
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#14
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Full Time Camper
Join Date: Aug 2012
Location: Belle River , Ontario
Posts: 1,753
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My flush is connected to the black tank . All sinks including out kitchen goes to grey tank.
__________________
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
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03-22-2017, 07:27 PM
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#15
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Full Time Camper
Join Date: Sep 2015
Location: Nv
Posts: 628
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Quote:
Originally Posted by dminer04
The manual for my ST32BH advised me to run the faucet for the outside sink while using the flush. This is also a benefit because when I see the water in the sink back up I know its full.
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I hadn't heard of this before. I'm assuming your outside sink drains into the black tank? So are you closing the outlet valve, and then watching for "black tank" water to back up into outer sink?... I must be misunderstanding this.
__________________
Steve & Sue
2017 Grand Design 297RSTS Travel Trailer
2017 Ford F-350 Lariat Crew Cab diesel 6.7 SW LB 11,500 lb GVWR package
Former: Crossroads ST26RB
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03-22-2017, 07:37 PM
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#16
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Full Time Camper
Join Date: Sep 2015
Location: Nv
Posts: 628
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My outside sink drained to the ground!...I never used it.
__________________
Steve & Sue
2017 Grand Design 297RSTS Travel Trailer
2017 Ford F-350 Lariat Crew Cab diesel 6.7 SW LB 11,500 lb GVWR package
Former: Crossroads ST26RB
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03-22-2017, 08:09 PM
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#17
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Family Vacation Member
Join Date: Nov 2012
Location: Virginia
Posts: 105
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Wow... Ya my outdoor kitchen sink is plumbed into my black tank. It makes it very convenient when we are camping without sewer so my grey tank doesn't fill up as quick.
__________________
Dustin
Nokesville VA
2008 F350 Super Duty 6.4
2014 Sunset Trail 32bh
"I work so I can CAMP, I camp to get away from WORK"
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03-23-2017, 06:54 AM
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#18
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Weekend Camper
Join Date: Feb 2016
Location: Georgia
Posts: 72
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Quote:
Originally Posted by harley
first off , dont put the tap(hose) on full ,just enough to put water thru,maybe 1/2 way. Mine leaks a bit at the aeroator (under the bath sink) if to much pressure.
It is just a nozzle in the upper portion of the tank on one side. There is an aerator between the outside fitting and the tank ,usually under the sink. This part is never checked a the factory or at most dealers and will probably have 2 loose hose connections. There is an arrow on it that should be facing the direction of water flow,some have been installed backwards.Look under the sink and tighten .Watch under there while someone turns the water on .
some say to only use when valve is open ,others do when valve is closed. If vent is hooked up correctly ,either way will be ok,as the vent will expel air when water is filling.
If you are at a full hookup site then it will work good to flush tank when you dump ,but if you are at a dump station ,there are alot of stations that do not have a hose fitting so a 5 gal water container dumped into the toilet bowl is better,and quicker. fill the jug up before you get to the dump station to save time.
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Hello,
Could you show a picture of the Aerator valve and how you determine if it is in backwards? My blackwater tank flush does not work at all.
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03-23-2017, 10:37 AM
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#19
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Full Time Camper
Join Date: Aug 2012
Location: Belle River , Ontario
Posts: 1,753
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My flush didnt work at first either as I later found out there was a kink in the hose from the aerator to the tank . The pressure would build up and leak under the sink . I cut the underbelly and found the kink and added 2' of hose and works ok now.
Look under your bath sink with a flashlight and look for an arrow on the side of the black 90 degree aerator showing water flow direction.
Dealers never check these things even on the pdi unless you ask them and they actually go to the trouble of getting the garden hose out.
__________________
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
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