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Old 09-25-2018, 08:10 AM   #1
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Grey tank -- open or closed -- what do you do and why?

Up to this point in my short RV experience, I've been leaving my grey tank open. For those using the through the wall sensors there are some that believe it's less likely to have slime buildup and mess them up if you leave it open.

My routine has to leave it open, and then close it the day before I need to flush my black tank.

Recently, I've seen people talk about keeping their gray tank closed until they are ready to dump, and the two reasons most often cited is to avoid sewer gasses and sewer bugs.

So, what do you do and why? And, have you had a problem with sewer gasses (I don't think the grey has a vent like the black to vent sewer gas) or sewer bugs/gnats invading your RV from an open grey?
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Old 09-25-2018, 08:19 AM   #2
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We have been out here for about 10 years now....we have always left our gray open, except as you say, before black drain and flush. Never had any of the issues you mention, gasses, bugs, etc. We're very careful what goes down the sink, no food, grease, etc. When we drain and close for travel, about once a month or so, we put in about 1/3 tank of water and 1/4 c of Simple Green to let it slosh about and do a little cleaning while we enjoy the smooth roads. Ok, that last part about the roads was sarcasm. Couldn't resist.
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Old 09-25-2018, 08:31 AM   #3
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The gray tank does have a vent. If you check, you will find two vent stacks on the roof, one black, one gray. I kept my gray open for years with no issues. Now, I keep it closed and dump the gray whenever it is full. There will be gunk that settles in the gray tank just like the black, just not as many solids. A full tank helps flush the solids out better. The solids decaying can smell as bad as the black tank.
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Old 09-25-2018, 08:42 AM   #4
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I keep our grey tank closed all the time, except when DW is doing laundry. For us, it usually means two emptying of the grey to one black. Once a month or so, when I remember, I put some Happy Camper in the grey tank. No odor problems.
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Old 09-25-2018, 08:46 AM   #5
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we keep the gray closed until we're ready to dump.
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Old 09-25-2018, 08:48 AM   #6
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Quote:
Originally Posted by tnedator View Post
Up to this point in my short RV experience, I've been leaving my grey tank open. For those using the through the wall sensors there are some that believe it's less likely to have slime buildup and mess them up if you leave it open.

My routine has to leave it open, and then close it the day before I need to flush my black tank.

Recently, I've seen people talk about keeping their gray tank closed until they are ready to dump, and the two reasons most often cited is to avoid sewer gasses and sewer bugs.

So, what do you do and why? And, have you had a problem with sewer gasses (I don't think the grey has a vent like the black to vent sewer gas) or sewer bugs/gnats invading your RV from an open grey?
I used to keep closed, but now that our Black tank has a wash down system I keep it open. My galley tank I started keeping open because the handle is between the tires under the big slide. I got tired of getting on my knees and climbing underneath to open it. The main reason for leaving closed was so you could use the gray to wash the sewer hose after dumping the black tank.
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Old 09-25-2018, 08:48 AM   #7
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Closed
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Old 09-25-2018, 08:51 AM   #8
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Ours is always closed unless doing laundry.
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Old 09-25-2018, 08:51 AM   #9
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Closed.

Like others have mentioned, I found that the ribbed sewer hose would accumulate a bit more gunk over the course of a season when the grey valve was left open all the time. I leave it closed now and open it as needed. 40 gallon capacity grey tank on my motorhome with the tank monitor calibrated to show Full at 30 gallons so that we still have the option to fit in one or two showers before needing to open the valve.
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Old 09-25-2018, 08:55 AM   #10
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Both valves open 11 months of year when FHU's are available, no issues in 6+ years full timing. Tips - No paper products down toilet and add soapy water to slosh around black tank on travel days.
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Old 09-25-2018, 08:55 AM   #11
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Closed. That said do what works best for you.
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Old 09-25-2018, 09:00 AM   #12
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Closed.....my galley tank handle is also located under the slide, so I hard plumbed it up to the front where the other two handle are and added another wastegate there......left factory gate intact so that I can flush that tank by shoving a hose thru it.....or by using the cap that a garden hose attaches to
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Old 09-25-2018, 09:06 AM   #13
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We leave ours closed mostly. The exception is doing laundry, as others have noted. We also generally run off the internal fresh water tank too, filling it up as needed unless doing laundry. Then again, a week in one spot is a long time for us as we are still in a traveling mode.
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Old 09-25-2018, 09:10 AM   #14
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6 years FTiming and my tanks stay closed until it is time to dump.
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