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Old 10-01-2018, 06:46 AM   #85
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Closed till full. Add a probiotic to eat all unwanted. Gray tanks also get live culture . also you don't want things from the sewer getting into your tanks.
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Old 10-01-2018, 06:55 AM   #86
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If you have ever walked around the campground and smell sewer gas around some RVs most likely the reason for that is that they have left their grey tank open. There is no trap in the system to keep the sewer gas from the system in the ground from coming out through the top. That is why the preferred method is to keep your gray valves shut until time to dump.
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Old 10-01-2018, 07:19 AM   #87
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We stay in a campground for a month at a time for last ten years. Always leave my grey tank open, black tank closed until almost full. Grey tank had no solids to clog pipes, if you have a clear bend, you will see that, Water isn't really grey, it is almost clear. I might close grey tank a day before dumping the black so I have a good swoosh of fairly clean water to clean the hose.
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Old 10-01-2018, 07:47 AM   #88
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scott toilet paper dissolves in water very quickly. I can't imagine having my bathroom garbage can carrying used toilet paper and then hauling the trash away after doing my duty. don't think the supermarkets appreciate the waste in their garbage either. sounds pretty unsanitary and a disservice to businesses that have garbage cans available for normal trash
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Old 10-01-2018, 07:48 AM   #89
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camping for 35-40 years and keep grey water open until time to dump black water. no sewer gas issues.
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Old 10-01-2018, 07:56 AM   #90
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We keep it closed all the time except to dump. Have read horror stores about sewer rats getting into the gray water tank.
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Old 10-01-2018, 08:16 AM   #91
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We keep our tanks closed until they need emptying as we had a major problem with sewer flies on the first long trip (cross country) we took after buying our Fleetwood Excursion. Now we seldom see any sewer flies on our trips.
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Old 10-01-2018, 08:52 AM   #92
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Closed!
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Old 10-01-2018, 09:09 AM   #93
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We keep ours closed until dump time. I see several have said they keep it closed except when doing laundry. Should I be opening the grey tank dump valve when running the washer? Until now I haven't done so.
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Old 10-01-2018, 09:57 AM   #94
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Quote:
Originally Posted by VideoFrog View Post
We keep ours closed until dump time. I see several have said they keep it closed except when doing laundry. Should I be opening the grey tank dump valve when running the washer? Until now I haven't done so.


I keep my closed even when using washing machine as long as there is room in the tank. I can do multiple loads of was meh and still not fill the tank.
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Old 10-01-2018, 10:18 AM   #95
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Some of the responses on this thread are absolutely unbelievable...cannot believe it!
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Old 10-01-2018, 11:21 AM   #96
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We keep ours open. To keep gases and critters out I just leave a low loop in drain line to act as a trap. Never had a problem.
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Old 10-01-2018, 12:45 PM   #97
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I'm sure that this subject is already over-discussed but wanted to add one thing that I didn't see posted. We leave our gray water open in order to not do valve management or overfill the tank. The same as we do at home!



Every home is connected to the sewer full time and open. Traps are what keep most bugs and odors out, no different in your RV. As many have mentioned, a little dip in the hose and you have a secondary trap.
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Old 10-01-2018, 06:49 PM   #98
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I keep ours closed and use it to help clean out the black when I dump it first. Never had any issues with smell.
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