Reply
 
Thread Tools Display Modes
Old 06-08-2015, 09:04 PM   #1
Member
 
dhind's Avatar
 
Join Date: May 2015
Location: Calgary, Alberta
Posts: 88
Black Water Flush

Perhaps a silly question, but why does the manual require the black water tank valves be open when doing a black water flush. Surely the tank is vented. Is the concern backing up the system through the toilet? I much rather fill it and let it flush out, than just run water through the bottom of the tank.

Not new to motorhomes, but new to our 2015 Georgetown 270.

Dave
__________________

__________________
dhind is offline   Reply With Quote
Old 06-08-2015, 09:09 PM   #2
Senior Member
 
Sbryant's Avatar
 
Join Date: Nov 2013
Location: Quitman MS
Posts: 357
If you don't open that valve, the back flush water will come out in the bathroom where the vent is.


Sent from my iPhone using Forest River Forums
__________________

__________________
Sbryant is offline   Reply With Quote
Old 06-08-2015, 09:09 PM   #3
Senior Member
 
SKnight's Avatar
 
Join Date: Feb 2014
Posts: 1,428
That's it, the concern is that you don't actually know how full it is. I could fill up, fill the toilet, then even go out the roof vent. Plus, once it's got water in it, the flush isn't flushing anymore, it's just filling with water.

When I dump it if there's not a line I'll flush it with the valve open, once it's running reasonably clear I'll close the black valve, let it flush for several minutes, then will open the valve again. That lets it build up some water, then will purge what's in the corners out.
__________________
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT

Nights camped in 2014-28, 2015-127, 2016-10
SKnight is offline   Reply With Quote
Old 06-09-2015, 06:58 AM   #4
Tim & Lisa Trempert
 
Join Date: Sep 2008
Posts: 439
Quote:
Originally Posted by dhind View Post
Perhaps a silly question, but why does the manual require the black water tank valves be open when doing a black water flush. Surely the tank is vented. Is the concern backing up the system through the toilet? I much rather fill it and let it flush out, than just run water through the bottom of the tank.

Not new to motorhomes, but new to our 2015 Georgetown 270.

Dave

Because you could contaminate the city water supply if the water level got up to the jet spray nozzles. Other reasons too, but this is the primary reason.


Sent from my iPhone using Forest River Forums
__________________
Tim & Lisa
2011 Georgetown 350
Trempert is offline   Reply With Quote
Old 06-09-2015, 07:19 AM   #5
Senior Member
 
bubbles's Avatar
 
Join Date: Dec 2012
Posts: 2,559
Quote:
Originally Posted by dhind View Post
Perhaps a silly question, but why does the manual require the black water tank valves be open when doing a black water flush. Surely the tank is vented. Is the concern backing up the system through the toilet? I much rather fill it and let it flush out, than just run water through the bottom of the tank.

Not new to motorhomes, but new to our 2015 Georgetown 270.

Dave
You have the right idea for black tank cleanout if it was installed correctly. Just don't start the cleanout and wander off. It takes about 20 minutes for my tank to fill up from the cleanout. I use the indicator and also look directly down the toilet to the tank to know when it is full. You will never have an indicator issue from build up with this procedure. I do use an enzyme additive between dumps. There are a lot of urban legend tales out there concerning the black tank cleanout. The vent is out the roof not in the bathroom. There is no way contaminated water can get in the fresh water system. These are just my input to some of the previous inputs.
__________________
bubbles is offline   Reply With Quote
Old 06-09-2015, 11:15 PM   #6
Member
 
dhind's Avatar
 
Join Date: May 2015
Location: Calgary, Alberta
Posts: 88
Thanks. That exactly what I expected. Just wanted to make sure I didn't miss anything. 20 years of RVi g, but still new information.
__________________
dhind is offline   Reply With Quote
Old 07-24-2015, 09:55 PM   #7
Junior Member
 
Join Date: Jun 2015
Posts: 11
I made the mistake of starting my black tank flush with the valve closed and got distracted. The next thing you know I've got water coming out of the toilet onto the floor. After drying up the mess and emptying the tank, subsequently black tank flashings result in water coming out of a pipe under the water heater area. The pipe has a rubber hose slide over it with the end molded in a pinched, but open, position. What could be causing the black tank flush to run out of this pipe even when the black tank valve is open?
__________________
Greg_Travels is offline   Reply With Quote
Old 07-24-2015, 10:29 PM   #8
Senior Member
 
VinceU's Avatar
 
Join Date: Dec 2011
Posts: 3,502
Quote:
Originally Posted by Greg_Travels View Post
I made the mistake of starting my black tank flush with the valve closed and got distracted. The next thing you know I've got water coming out of the toilet onto the floor. After drying up the mess and emptying the tank, subsequently black tank flashings result in water coming out of a pipe under the water heater area. The pipe has a rubber hose slide over it with the end molded in a pinched, but open, position. What could be causing the black tank flush to run out of this pipe even when the black tank valve is open?
There is a non-return/vacuum breaker device mounted about 3-4 feet above the tank. Fresh water is routed into the RV, up to the vac break down to the tank flush and sprayed into the tank. Purpose is if shore pressure is lost and the system develops a vacuum, the breaker will prevent the contents of the black tank from being syphoned back into the city water system.
Your problem sounds like a defective vac breaker. Found in closets, in hollow walls. In your case above the dripping compartment. Home repair centers sell them.
__________________
VinceU is offline   Reply With Quote
Old 07-25-2015, 01:06 PM   #9
Member
 
Coach 350's Avatar
 
Join Date: Aug 2012
Location: South Jersey
Posts: 74
I agree with Bubbles. I empty it first then empty the grey water tank. At campsites I fill it 1/3 then flush again and again. Never an odor and my sensors are kept clean too.



Sent from my iPhone using Forest River Forums
__________________
Coach 350 is offline   Reply With Quote
Old 07-25-2015, 01:40 PM   #10
Senior Member
 
Islander's Avatar
 
Join Date: Jul 2014
Location: Nanaimo
Posts: 409
Greg_Travels ... your post gave me chills down my spine !!!!

I love my Black Water Flush and am thinking of adding some to my 2 gray holding tanks as well.

When I dump I will always top up the black tank with water with the Flush- Sprayer.... fortunately I can hear the spraying water (inside the tank) form outside the RV and when I stop hearing it spray I Open The Dump Valve.
If I am leaving the CG I will fill/rinse the black tank at least once more with the Black Flush Sprayer...and again as soon as I do not hear the 'spray" I pull the dump lever.
This may take some time BUT I NEVER Leave while doing this process....for the very reason you mentioned in your post.

Side note: if you can not hear the spraying water from outside your RV try using a 2ft piece of 1/2" wooden dowel...round off one end and place the round end to your ear (at the position between your temple and outside your ear) and the other end near the vicinity of the back tank or buy a cheap stethoscope .

hope this helps

Islander
__________________

__________________
'07 WildCat 30 RLBS ~ West Coast Edition ~
Trail Air - Tri Glide Pin Box
2000 F350 Lariat DRW 4x4 7.3 Diesel 88k miles
Edge programmer, 4" SS exhaust turbo/back,
Tru-Cool Max Trans Cooler, Bilstein Shocks
Vancouver Island, B.C., Canada
Islander is offline   Reply With Quote
Reply

Tags
black, black water, water

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:12 AM.