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Old 06-03-2021, 12:14 PM   #1
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Grey water tank - leave open while camping?

After hooking up the sewer we open the grey for the duration of our stay. A friend told me he never does that because the tank could fill with gas from the sewer and end up in our coach! Not sure if the gases could make it past the P traps? What do you do?

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Old 06-03-2021, 12:17 PM   #2
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Totally possible as there is no "P" trap to keep gasses out of the tank. There are traps to keep gasses from getting in the coach.


I leave mine open until I get ready to dump the black tank then I close the grey to use as a hose flush
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Old 06-03-2021, 12:21 PM   #3
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The tank is vented through the roof; you can't get a gas build up. If we are going to be in a site for a week or more I leave the gray tank open. I'll close it to get enough water to clear the hose after dumping the black tank. The way we use water we can go a week on the blank tank but the grey fills in a couple of days.
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Old 06-03-2021, 12:25 PM   #4
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No. I keep both valves closed so the tanks can fill to at least 2/3rds, then dump and reclose the valves. I want enough water to build up in the tanks to whoosh out any solids or crud that may settle in the bottom of the tanks. The exception is, when my wife wants to do laundry, our washer/drier combo requires the grey valve to be open. After she's done I close the valve.

Yes, you could get sewer gasses venting back into your system, but if all your traps are working, it'll vent out your roof vents, not inside. Depending on the wind this could make it stinky around your rig. We stayed in one campground where there were a lot of long term campers and it was obvious people left their grey valves open because, the place reeked of sewer depending on the wind direction.
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Old 06-03-2021, 12:33 PM   #5
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X2 on what Tom said
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Old 06-03-2021, 12:36 PM   #6
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I see that many people put intentional low spots in the drain line, in effect putting a P trap in the line itself. That would eliminate the issue of sewer gas and/or flies getting back into the RV.
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Old 06-03-2021, 12:38 PM   #7
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We leave the gray open until the morning before departure, then let some accumulate for hose flush after the black dump.
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Old 06-03-2021, 12:43 PM   #8
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There are warning signs all over my regular campground to not free flow the sewer lines, it causes problems with their septic system.
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Old 06-03-2021, 01:04 PM   #9
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Have you ever SMELLED grey waste....old grease/oils from cooking, bits of food rotting, hair breaking down, pee, slughed skin cells, scum etc

Grey can stink worst then black tank

I prefer to leave grey tank dump valve close just like black
Then when time to dump I only have to mess with tanks valves once
Plus I prefer the WHOOSH effect on black AND Grey to remove 'stuff'

I never leave sewer hose connected......birds like pecking at it and if in a CG maintenance folks can whack it when weed whacking/mowing etc

Hookup hose, open black then follow with grey
Simple........
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Old 06-03-2021, 01:08 PM   #10
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If you leave the gray tank open all the time food debris, soap scum, grease, etc can accumulate and dry out on the bottom of the tank. Better to keep it suspended or at least wet in the bottom so it will flush out when dumped. Having obtained an Itasca with gray tank problems, I don't want to go through that cleanout procedure again. Just my $0.02 worth.
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Old 06-03-2021, 01:09 PM   #11
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Closed until it's close to full.
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Old 06-03-2021, 01:14 PM   #12
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Tank full, then dump --- WHOOSH



Tank dump valve left open ---trickle
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Old 06-03-2021, 01:20 PM   #13
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Quote:
Originally Posted by dons2346 View Post
Totally possible as there is no "P" trap to keep gasses out of the tank. There are traps to keep gasses from getting in the coach.


I leave mine open until I get ready to dump the black tank then I close the grey to use as a hose flush

X2! I agree!
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Old 06-03-2021, 01:33 PM   #14
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Old MH, left both valves open, 4 years no issues, even with multi month stays.

New MH, I just leave the gray open. With the installed macerator, the gray flows through it.

The day before departure, I close the gray, saving water for a hose flush, after pumping black.

Does anybody store your waste in your house's for a weekly dump ?
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