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Old 07-22-2016, 10:45 AM   #1
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Gray/Black Tanks and longer term storage

What do folks do to their gray and black tanks when putting away their camper for long periods during warm weather (I know...HERESY!!)?

We always do 2-3 flushes when dumping black after campout. But surely some residue probably persists on tank sides, etc. And we've had odors from gray after trailer has sat for a month so we need to get a better system.

Should we leave some water in both black and gray with some kind of chemical?

Worried that there could be seals that dry out due to summer heat and evaporation. But we also want to avoid any stagnant water in tanks and smells (which is why I was thinking storing clean and dry might be better).

Appreciate hearing your experiences.

-Dave
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Old 07-22-2016, 10:52 AM   #2
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I always leave about 5gal of water in my black tank along with a chemical packet and a shot of fabric softener. I also leave a bit of water in the toilet bowl to keep the seal wet.

I also dump a few gallons into the grey tank along with a splash of Pine Sol in each drain, and then a bit more water in each drain.
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Old 07-22-2016, 10:52 AM   #3
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Getting any of the tanks dry is a fool's errand. You probably could do it, but the effort would be excessive.


I'd say split up a gallon of RV antifreeze amongst the traps and toilet. That'll leave a (relatively) non-evaporating material that is compatible with all of the seals and pipes in the tanks and waste plumbing.
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Old 07-22-2016, 11:33 AM   #4
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We really hate camping in the heat. No kids at home anymore, no driving reason to go in July or August.

That said we typically leave ours sit for those 2 summer months. We've been doing this for several years now and have not done anything special with the black tank. No smells or anything else.

The only thing I do is check the toilet every couple of weeks to make sure there is still enough water to cover the seal.
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Old 07-22-2016, 12:22 PM   #5
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Good advice on keeping toilet seal covered with water. The water I do leave in it usually evaporates. I need to make a point to visit storage site every couple of weeks during hot summer months to check and add water.

Many of the state parks we visit do not have sewer hookups so I've been reluctant to add a bunch of water (with chemical or detergent) to tanks while in storage. But our storage site has dump station so maybe I'll start adding the water and just empty tanks when pulling out.

Thanks for the feedback!
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Old 07-22-2016, 01:40 PM   #6
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You can also throw a tablespoon of oil in the toilet bowl and let it cover the rubber seal as well. That will help prevent it from drying out and won't evaporate either.
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Old 07-22-2016, 02:08 PM   #7
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Cover the toilet bowl with Saran Wrap to eliminate the evaporation. Also put one piece of TP on the SW so one can notice it and not pee on it in the dark.
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