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03-09-2017, 12:57 PM
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#15
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Senior Member
Join Date: Mar 2013
Posts: 515
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Gray open, black closed. My black tank is good for about 10 days, while the gray tank last maybe two days between showers and dish-washing when not in water-conservation mode. I dump my black tank once a week, and shut the gray tank's valve the day before. I've never had an issue with sewer gas - there are P-traps in the camper for that, and the gray and black tanks are vented through the roof.
My gray and black tanks are the same size, and not as large as those on bigger campers.
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03-09-2017, 01:02 PM
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#16
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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Quote:
Originally Posted by pasonsinokc
Thank you. I have always left them closed, but someone told me differently recently and I began to question myself.
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They are the one's heading for a problem, not you.
FWIW I think I finally found out why some people leave the gray open. Washing machines. For us the gray and black fill up more or less equally so we leave both closed. I can see where a washer or maybe dishwasher would upset that balance.
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03-09-2017, 01:21 PM
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#17
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Senior Member
Newmar Owners Club Freightliner Owners Club Spartan Chassis
Join Date: Apr 2012
Location: ON THE ROAD...SOMEWHERE
Posts: 6,973
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Quote:
Originally Posted by nothermark
They are the one's heading for a problem, not you.
FWIW I think I finally found out why some people leave the gray open. Washing machines. For us the gray and black fill up more or less equally so we leave both closed. I can see where a washer or maybe dishwasher would upset that balance.
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BINGO!
Black closed, gray open for those very reasons. Never had a problem with odors either. Don't use any chemicals.
__________________
Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
[SIGPIC][/SIGPIC]
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03-09-2017, 02:12 PM
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#18
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Senior Member
Tiffin Owners Club
Join Date: Nov 2011
Location: Foley, AL
Posts: 1,093
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I do exactly what sd75mac does. Works [emoji106].
__________________
Les & Pam Warden
(Tiffin) 2017 Phaeton 40QBH; 2023 Wayfarer 25RW (coming soon)
2016 Jeep JKUS with Ready Brute Elite towbar
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03-09-2017, 02:15 PM
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#19
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 6,401
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Quote:
Originally Posted by pasonsinokc
When hooked up to sewer and camping for numerous days, do you leave your black and grey tank valves open or do you keep them closed and dump when needed?
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No to keeping them open.
__________________
Wayne & Roberta
08 Winnebago Destination 39W Gas UFO Workhorse Chassis......It's really weird being the same age as old people. I thought getting old would take much longer.
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03-09-2017, 02:19 PM
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#20
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Senior Member
Join Date: Jul 2015
Posts: 1,881
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I don't think anyone mentioned this, but don't leave them open 
__________________
2010 Phaeton 40QTH on a PG Chassis.
2017 Lincoln MKX.
Air Force One brake system and Blue OX Towbar.
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03-10-2017, 06:07 AM
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#21
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Senior Member
Join Date: Jul 2015
Posts: 680
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No, we never leave either valve open.
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03-10-2017, 09:17 AM
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#22
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Senior Member
Join Date: Mar 2011
Posts: 221
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We never leave the black tank open. We dump and rinse several times when almost full.
We always leave the gray tanks open. We have a dish washer and clothes washer.
We have never had a pyramid in the black or gas come back in the gray.
When we travel we have 1/4 to 1/3 full in black and gray to help clean them.
__________________
2017 Alpine 3301GR
2018 Ram 3500
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03-10-2017, 11:19 AM
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#23
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Senior Member
Tiffin Owners Club
Join Date: Apr 2009
Location: Home in warm Sou Calif for the winter.
Posts: 1,401
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Quote:
Originally Posted by sd75mac
After dumping (and flushing) the black tank then flushing the hose with gray tank, I add 1 - 2 gallons of fresh water to the black tank. My reasoning is the fresh water in the black tank will slosh around while driving to further keep the residual solids from sticking to the tank and keep the black tank moist.
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You might think about adding some liquid laundry detergent to that 2 gallons of fresh water when you travel.
Ron
__________________
Ron, Sandie and Lilly
2013 Tiffin Phaeton 42LH 400 ISL | 2011 GMC Terrain SLT-2
Roadmaster All Terrain | US Gear Unified Brake System | Pressure Pro
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03-10-2017, 11:27 AM
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#24
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Senior Member
Join Date: May 2015
Location: The Hills of Mickey's Original Home
Posts: 278
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Quote:
Originally Posted by lanerd
You might think about adding some liquid laundry detergent to that 2 gallons of fresh water when you travel.
Ron
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Thanks,
After dumping, DW always adds tank deodorizer. And we never use the shower and only CG water for dish washing. Thus, the gray tank has mucho Dawn floating thru the gray tank dump.
__________________
Harold and Cynde
2013 F150 S/C 4x4 Ecoboost, 2014 Winnebago UltraLite, Chasing trains where ever we are.
[SIGPIC]sigpic160806_2.gif[/SIGPIC]
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03-10-2017, 11:27 AM
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#25
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Senior Member
Join Date: Jan 2016
Posts: 625
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Black closed. Grey usually closed. I like to leave it closed so I can use the grey tank contents to wash out the sewer hose after I dump the black tank. We have relatively small tanks, so we are usually dumping daily. Never less than every other day.
Roger
__________________
TV 2010 Ford F-150 Supercab
TT 2016 Jay Feather 23RLSW
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03-10-2017, 11:30 AM
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#26
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun 
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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03-10-2017, 12:14 PM
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#27
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Senior Member
Join Date: Jan 2016
Posts: 625
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Quote:
Originally Posted by Bigd9
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YES!!
__________________
TV 2010 Ford F-150 Supercab
TT 2016 Jay Feather 23RLSW
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03-10-2017, 12:23 PM
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#28
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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Quote:
Originally Posted by pasonsinokc
When hooked up to sewer and camping for numerous days, do you leave your black and grey tank valves open or do you keep them closed and dump when needed?
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Nope, never, nada, no-no, nah-nah, nine.....
I don't have to justify why or what for, people can do whatever they want but I do what has worked for me well over 14+ years of Full-time RVing and will continue to do it that way until my last RVing day.
Dr4Film ----- Richard
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