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Old 06-07-2015, 02:27 PM   #11
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When camping ours stay closed until time to dump. We are mostly state park campers and there is usually no sewer connection.

When there is a sewer connection we leave the valves closed until time to dump, too. Our black and shower grey are on the same outlet. As others have stated you don't want a "poo pile" in your tank, so use lots of water when you flush and then dump the black first, followed by the grey. As to the galley grey, leaving the valve open will allow bits of food to collect in there and that can get smelly. Allowing that tank to fill and then dump all at once washes the stuff out.

I put 1/4 cup (or so) of laundry soap in all my tanks along with TST or Thetford stuff, what ever formaldehyde-free stuff Walmart has on sale. Makes the tanks clean easier. Stuff doesn't tend to stick to the sides.

And when in storage, I un-cork the outlets and open the valves to let the tanks air out. YMMV. I might get poo-poo'ed for the suggestion, and it might eventually bite me, but thus far it's been odor free camping and all is swell for 8 years now.
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Old 06-07-2015, 03:10 PM   #12
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[/QUOTE]

And when in storage, I un-cork the outlets and open the valves to let the tanks air out. YMMV. I might get poo-poo'ed for the suggestion, and it might eventually bite me, but thus far it's been odor free camping and all is swell for 8 years now.[/QUOTE]

I always use laundry soap as well but leave some water in the black tank to keep things "lubricated". Do the rest of you keep tAnks closed in storage?
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Old 06-07-2015, 03:30 PM   #13
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And when in storage, I un-cork the outlets and open the valves to let the tanks air out. YMMV. I might get poo-poo'ed for the suggestion, and it might eventually bite me, but thus far it's been odor free camping and all is swell for 8 years now.[/QUOTE]

I always use laundry soap as well but leave some water in the black tank to keep things "lubricated". Do the rest of you keep tAnks closed in storage?[/QUOTE]

ALWAYS keep tanks closed when not dumping ...don't want to provide a home to critters

Here is a great home brew:
Equal parts of
Water
Pine Sol
Dawn Dish Soap (and ONLY Dawn - it is the best de-greaser out there)
Super Clean

To the above (assuming you made a gallon) add 1 cup:
Calvin water softener (Liquid)
RV Digestit

I put this mix in my bluestreak [http://www.bluestreakchem.net]

And 4 or so OZ in each grey water tank
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Old 06-07-2015, 05:38 PM   #14
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Creating a "P" trap

Here is another way to not get a smell from the park's system. When you lay the hose out, using your hose support, create an S in the hose. In other words create a "p trap with your hose. As the water drains from the grey tanks (which I leave open) they will keep the trap full that you created and eliminate any odor coming back at you.
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Old 06-07-2015, 05:51 PM   #15
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Best and easiest solution is just keep all the valves shut until ready to dump.
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Old 06-07-2015, 05:56 PM   #16
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We are full timers and draining the grey tanks every day gets old quickly and it's not necessary. Once a month I run the hose through the Camco reverse flush into all the tanks and I never have any problems. We try to make our experience as close to the comforts of home as possible and fooling with the holding tanks really distracts from the experience. Of course we keep the black tank closed until it is full.
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Old 06-07-2015, 07:14 PM   #17
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Although not quite full time, we used to stay in our 5th wheel for 5 months in winter. Always left both tank drain valves closed. Trash day was Monday and Thursday, so on every trash day both tanks got dumped. Simple and almost foolproof.
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Old 06-07-2015, 07:17 PM   #18
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Never, ever, leave our valves open. Worried about sewer gases backing up into the RV. It only take 10 minutes to dump and I always want plenty of Grey water to flush the Black. An open line is an invitation to methane gas. That gas can seep thru the smallest of opening. Full closed for me - all the time.
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Old 06-07-2015, 07:25 PM   #19
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Sounds like a good plan. I'm just too lazy to deal with it as we both shower two or three times a day and I would have to drain the tanks daily. The bottom line is everyone has their own method and whatever works for you it what counts.
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Old 06-07-2015, 07:26 PM   #20
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Leaving a "P" trap in the line eliminates the "open line" and therefore any chance of methane gas running back up into the RV.
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