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Old 06-20-2014, 09:30 AM   #1
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Black and gray tanks

I have a newbie question on holding tanks.
I empty tanks before I leave campground. If I use black and gray tanks on way home from camping and tanks show 1/3 full is there any harm in leaving the tanks with waste in them when I return to storage prior to my next camping trip, (3 or 4 weeks), or should I empty them again prior to storage.


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Old 06-20-2014, 09:33 AM   #2
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I would empty, flush & then add some water to cover the seals, with treatment in it. That's what we do. Leaving waste in storage that long can get pretty "ripe" - especially in hot/humid weather.


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Old 06-20-2014, 09:36 AM   #3
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I agree ..... dump the tanks and drain the hot water tank as well....
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Old 06-20-2014, 10:38 AM   #4
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I have no place to dump the black tank when I get home. I dump when we leave the last stop and refill the black tank with 2 minutes of water. We use it on the way home. When I get home I add pine power to the tank. It sits that way until our next trip sometimes can be 6 weeks. When we leave on the next trip I add more pine power and ice to the tank. At our first stop I dump the tank during setup and backwash, add 2 min of water again to the tank. Never had a problem doing this for the past 4 years that we have owned it. I don't drain the water heater either until we stop for winter where it sits for 4 months of tax season. I replace the anode in the water heater every spring.
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Old 06-20-2014, 11:01 AM   #5
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I don't worry about leaving some in the black tank if we will be traveling again within the next month. I use the Happy Camper tank treatment and have never had any smell!
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Old 06-20-2014, 11:07 AM   #6
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This gets discussed here quite a bit and IMHO it's best to dump and add a few gallons of fresh water to both tanks... following Lori's advice.

Many folks report leaving a small/reasonable amount of waste in the tanks without any trouble but I don't do it.

Best of luck.

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Old 06-20-2014, 12:21 PM   #7
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Thanks to all who took the trouble and time to respond
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Old 06-20-2014, 02:12 PM   #8
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Obviously everyone has different ideas regarding your question. I would question the accuracy of your black and gray tank gauges if they show 1/3 full on a trip home. How long a trip are you talking ?
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Old 06-20-2014, 05:15 PM   #9
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Yup, I don't do that but each to their own !

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gray tank, tank

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