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07-31-2015, 05:29 AM
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#1
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Montana Fan
Join Date: Mar 2015
Location: Mountain Home
Posts: 148
M.O.C. #17188
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Full hookups
Going on a semi permanent assignment in northern Louisiana. We will have full hook ups and I was just wanting to know what everyone's opinion is on gray and black tank dumping. Leave closed and dump every few days? Or leave open all the time?
We need your expertise.
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Andy and Nancy Parish
Marlee Claire and Magnolia Caroline
Pomeranian bosses AKA The MCfurries, Big white cat "G"
Mountain Home, Arkansas
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07-31-2015, 05:32 AM
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#2
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Seasoned Camper
Join Date: Sep 2014
Location: lewisville
Posts: 81
M.O.C. #15734
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leave closed and dump as needed is the way we go.
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07-31-2015, 06:09 AM
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#3
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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We keep them closed and dump when needed usually every two or three days. I mean all you have to do is pull a couple of handles.
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07-31-2015, 06:12 AM
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#4
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Seasoned Camper
Join Date: Mar 2009
Location: Loogootee
Posts: 81
M.O.C. #9197
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My wife and I spend 4 months in Florida, and everyone there leaves their gray tank 1 open . They keep black tank and gray tank 2 closed until it's time to dump. We done that for years and it works fine.
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07-31-2015, 06:14 AM
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#5
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Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
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Black tank closed other two open till a day before I dump bleach tank.
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Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
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07-31-2015, 06:58 AM
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#6
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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If you leave black tank open you will have problems. It will build a waste pyramid over time, not pleasant to clean
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07-31-2015, 07:22 AM
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#7
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Montana Fan
Join Date: Mar 2015
Location: Mountain Home
Posts: 148
M.O.C. #17188
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Thank you, definitely don't want any poop-sicles!
__________________
Andy and Nancy Parish
Marlee Claire and Magnolia Caroline
Pomeranian bosses AKA The MCfurries, Big white cat "G"
Mountain Home, Arkansas
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07-31-2015, 08:03 AM
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#8
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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We leave our gray open, black closed until time to dump.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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07-31-2015, 08:10 AM
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#9
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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When leaving your tank valves open, your rig becomes a vent for the campground's sewer system. If you can't create a trap in your waste hose by having a sufficient dip to trap waste water which will block sewer gas, it is best to leave all the valves closed, and dump as needed. It is quite obvious when walking around a campground where there are waste valves open.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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07-31-2015, 08:19 AM
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#10
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Leave them closed until ready to dump. Don't dump black too often. Let it get to 3/4 or so full before dumping. Dumping black too soon can be almost as bad as leaving valve open. We full time and use our own facilities all the time and only have to dump black every two weeks. Your mileage may vary! 
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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07-31-2015, 08:41 AM
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#11
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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What Bob said........"When leaving your tank valves open, your rig becomes a vent for the campground's sewer system. If you can't create a trap in your waste hose by having a sufficient dip to trap waste water which will block sewer gas, it is best to leave all the valves closed, and dump as needed. It is quite obvious when walking around a campground where there are waste valves open. '
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07-31-2015, 10:30 AM
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#12
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,156
M.O.C. #6433
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We leave they grey valve open until the black tank is nearing ready to dump. Then I will close the grey valve for a shower or two to build enough water to flush the sewer hose after dumping the black. More than once I found myself standing in an inch or two of water in the shower at night because the grey tank was full. Had to put clothes back on and go outside to dump it. Having a washer/dryer can fill it unexpectedly and I sure don't want it to fill while the washer is draining.
All my grey and galley drains have traps so sewer gases do not come back inside.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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07-31-2015, 10:30 AM
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#13
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Montana Master
Join Date: Mar 2005
Location: Port Orchard
Posts: 1,153
M.O.C. #3403
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I agree with rohrmann...also I have heard of bugs and rodents in the park sewer system coming up an open valve and getting in the tank.
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07-31-2015, 11:01 AM
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#14
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Montana Master
Join Date: Mar 2014
Location: Sioux Falls
Posts: 505
M.O.C. #14162
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Blacks closed, empty every 10 days (we fulltime). Gray closed for a day prior to have the water to flush lines.
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Steve & Sheryl Engels
2018 Montana 3790RD
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07-31-2015, 02:42 PM
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#15
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Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,253
M.O.C. #17164
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I also leave grey open until I am getting close to needing to dump the black tank. Then as stated before close the grey and some dish washing and a couple of showers or laundry and then you can dump the grey and flush the black tank residue out of your hose.
Tom Marty
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08-01-2015, 12:52 AM
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#16
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Montana Master
Join Date: Mar 2013
Location: Frostproof, FL USA
Posts: 2,362
M.O.C. #13272
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Quote:
quote:Originally posted by BB_TX
We leave they grey valve open until the black tank is nearing ready to dump. Then I will close the grey valve for a shower or two to build enough water to flush the sewer hose after dumping the black. Having a washer/dryer can fill it unexpectedly and I sure don't want it to fill while the washer is draining.
All my grey and galley drains have traps so sewer gases do not come back inside.
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X2 - exactly
__________________
Previous: 2008 Montana 3400RL & 2014 3725RL
Current: Full Time 2022 SOB TT Toy Hauler
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08-01-2015, 02:04 AM
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#17
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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We leave everything closed and dump every 7 days. Works for us and have plenty of gray water for flushing out the drain lines and sewer hose.
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08-01-2015, 02:18 AM
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#18
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Montana Fan
Join Date: Mar 2015
Location: Mountain Home
Posts: 148
M.O.C. #17188
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Great info, thanks to a great forum made up of great people.
__________________
Andy and Nancy Parish
Marlee Claire and Magnolia Caroline
Pomeranian bosses AKA The MCfurries, Big white cat "G"
Mountain Home, Arkansas
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08-01-2015, 05:28 AM
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#19
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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The real key is if you have a washer and or dish washer. With the water they put out leaving the grey tanks closed is asking for trouble.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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08-01-2015, 05:53 AM
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#20
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Montana Fan
Join Date: Mar 2015
Location: Mountain Home
Posts: 148
M.O.C. #17188
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No dishwasher, but going to get clothes washer. Good info.
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