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02-25-2019, 01:43 PM
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#1
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Member
Join Date: Jun 2013
Posts: 46
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What do you use to backflush grey water tank drain pipe
My gray water tank is draining very slowly. I have checked the air admittance valve, the vent cap on the roof, check to make sure the valve was opening all the way and all seems to be working properly. So I am assuming that there is some type of clog in the opening for the drain for the gray water tank. I have put laundry detergent in and let it soak. No change. The gray water tank connects with a 1 and 1/2 inch line into the three inch line for the RV. It is about two to three feet in from the opening at sewer line end and is a right angle turn from the 3 inch pipe. What do you use to backflush that type of greywater tank line? A hose that you run up there or a power washer fitting on the end of the sewer line or????
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02-25-2019, 01:53 PM
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#2
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Senior Member
Join Date: Oct 2018
Location: Indiana
Posts: 553
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Grey tank ? You mean when you are dumping, emptying the tank? The same valve as the Black tank? Or are you saying it drains slowly at the sink ,to the grey tank?
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02-25-2019, 01:54 PM
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#3
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Senior Member
Join Date: Jan 2017
Location: Kalamazoo
Posts: 2,139
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I have read threads about construction debris blocking drains. a circle cut out from the floor during the construction process could of worked its way in front of the drain line?
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02-25-2019, 02:06 PM
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#4
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Senior Member
Join Date: Feb 2019
Posts: 145
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I use the Rhino blaster pro to back flush my black tank. It could be used for the gray tank as well.
https://www.campingworld.com/rhino-b...gate-valve-e-f
__________________
Chris
2020 Grand Design 337RLS
2019 Rockwood 2608BS (Sold)
2005 Rockwood 2516G (Sold)
2018 Chevy 2500 6.0 / 4.10's
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02-25-2019, 02:06 PM
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#5
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Member
Join Date: Jun 2013
Posts: 46
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There are three separate tanks on the trailer. Each has its own drain valve. The black tank empties into the 3-inch pipe and when you pull the cable for it to open the drain valve, water comes gushing out. Same for the galley tank. The gray tank from the bathroom is the one that drains slowly when you pull the drain tank valve cable. The gray and the galley tank connect into the 3-inch pipe and drain out of it . There might be debris in there but not sure. It always drained very well before and gushed out. But it stopped doing it.
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02-25-2019, 02:06 PM
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#6
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,518
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We use a Flush King to back fill our tanks completely and drain. If having sensor problems, we might travel with full tanks and chemicals. Might also dislodge a clog.
If you have a stubborn clog and can get to to valve, remove the center of the valve (four bolts) and hopefully there is enough wiggle room so you can insert a hose.
Otherwise rent or buy one of those inspection cameras to see what is going in. Here's a cheap one: https://www.amazon.com/USB-Borescope...40107488&psc=1
Good luck!
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-25-2019, 02:08 PM
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#7
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Member
Join Date: Jun 2013
Posts: 46
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Thanks for the idea. I can get at the valve easily and would be able to pull it out. So I might be able to do what you suggest in putting a hose in there to backflush.
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02-25-2019, 04:59 PM
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#8
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Senior Member
Join Date: Sep 2009
Location: Lexington, NC
Posts: 2,621
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Quote:
Originally Posted by NMWildcat
We use a Flush King to back fill our tanks completely and drain. If having sensor problems, we might travel with full tanks and chemicals. Might also dislodge a clog.
If you have a stubborn clog and can get to to valve, remove the center of the valve (four bolts) and hopefully there is enough wiggle room so you can insert a hose.
Otherwise rent or buy one of those inspection cameras to see what is going in. Here's a cheap one: https://www.amazon.com/USB-Borescope...40107488&psc=1
Good luck!
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Yep. I would try the Flush King first.
__________________
2018 Coachmen Apex 249 RBS
2010 Silverado LT 5.3 V8
The world is a great book, of which those who never stir from home
read only a page. - St. Augustine
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02-26-2019, 02:29 PM
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#9
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Senior Member
Join Date: Apr 2014
Posts: 567
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Don't forget the stink pipe going up. If that's clogged with rodent or bird debris the tank can drain slower.
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02-26-2019, 04:24 PM
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#10
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Senior Member
Join Date: May 2017
Location: Southeast
Posts: 1,047
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I don't. The grey plumbing stays clean as it is soapy water. We don't dump grease or food down the sink. We use grey dump to wash out the hose after black tank dump.
__________________
2018 Forest River Rockwood Roo
24WS
2019 Ford SD F-350 SRW Lariat
Tow & Gooseneck Prep
FX4 Off Road (4X4)
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02-26-2019, 07:05 PM
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#11
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Member
Join Date: Feb 2019
Location: Woodway, TX
Posts: 52
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Agree with Anderson15 that easiest backflush for drain line is the RhinoBlaster -it has worked for us!
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02-28-2019, 02:28 AM
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#12
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Senior Member
Join Date: Apr 2015
Location: Ontario, California
Posts: 2,146
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Quote:
Originally Posted by Kimber45
I have read threads about construction debris blocking drains. a circle cut out from the floor during the construction process could of worked its way in front of the drain line?
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That would be my quess. Maybe one of the inexpensive fiber optic camera attachment for your cel phone or a flashlight and a long inspection mirror would give you confirmation of the blockage.
__________________
Tom48
In Sunny So Cal /w
Now in 2005 Holiday Rambler Ambassador DP and The Hot Air Balloon RESTLESS
NO MORE Tricked out
2017 Sandstorm 250 T.H.
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02-28-2019, 07:15 AM
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#13
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Senior Member
Join Date: Dec 2017
Posts: 606
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Best bet, start out with a inspection camera and go from there. This way you know what type of blockage you have.
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02-28-2019, 09:00 AM
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#14
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Senior Member
Join Date: Jul 2009
Location: Warsaw,NC
Posts: 7,184
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My Cedar Creek grey water tanks drains kinda of slow but we hardly ever dry camp so it doesn’t matter. I just leave the grey water tank valves open, I close the bathroom grey water tank a day before we leave.
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02-28-2019, 12:04 PM
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#15
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Gold Tee Box
Join Date: Nov 2016
Location: Rolla, MO
Posts: 563
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Curious, what would block up a Grey Water drain...food debris from the sink?
__________________
Success is hiring someone to mow your lawn so you can play golf for exercise.
2018 GMC 2500 Duramax Denali
2018 Coachman Freedom Express 287BHDS
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02-28-2019, 03:31 PM
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#16
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Just as confused as you
Join Date: Aug 2013
Location: south central Wisconsin
Posts: 5,108
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Quote:
Originally Posted by Teetime
Curious, what would block up a Grey Water drain...food debris from the sink?
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As had been said before, if when the manufacturer cut the hole for the drain and vent the cut out part(s) fell inside they could make their way to the drain opening. Another is if the drain valve has a cable pull and the cable is not anchored properly it could cause the valve to not open fully, or close fully for that matter.
__________________
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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02-28-2019, 03:44 PM
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#17
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waybeck2018
Join Date: Sep 2018
Location: Central Alabama
Posts: 762
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Quote:
Originally Posted by NMWildcat
We use a Flush King to back fill our tanks completely and drain. If having sensor problems, we might travel with full tanks and chemicals. Might also dislodge a clog.
If you have a stubborn clog and can get to to valve, remove the center of the valve (four bolts) and hopefully there is enough wiggle room so you can insert a hose.
Otherwise rent or buy one of those inspection cameras to see what is going in. Here's a cheap one: https://www.amazon.com/USB-Borescope...40107488&psc=1
Good luck!
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I am ordering one of these cameras today. Not necessarily for a gray line inspection but rather for where that DA** mouse is in my AC ducting!
__________________
2012 F-250, 6.7 Super Duty Powerstroke; 2019 291 BR Primetime Tracer,
Days camped in 2018-61
Looking Forward to Completing This Map Soon !
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02-28-2019, 09:39 PM
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#18
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Jayhawker
Join Date: Jul 2018
Location: Suburbs Kansas City
Posts: 290
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We use the Flush King to back flush our black water and grey water tanks when we are at the dump station. On/Off water valve attached has a back flow preventer valve built in.
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02-28-2019, 10:07 PM
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#19
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Canadian Member
Join Date: Feb 2012
Location: Eastern GTA, Ontario, Canada
Posts: 6,233
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If you’re using the Flush King or the Rhino Blaster, have a look at this video.
__________________
2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)
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03-01-2019, 07:30 AM
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#20
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Senior Member
Join Date: Dec 2017
Posts: 606
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Quote:
Originally Posted by itat
If you’re using the Flush King or the Rhino Blaster, have a look at this video.
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One of the main reason i never bought one. The toilet wand is the best imo.
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