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Old 05-08-2015, 03:50 PM   #1
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Black Tank, drainage frequency?

Alright, here is my conundrum...I use my RV pretty much every weekend, but generally not for anything extravagant - sometimes just to a friends house, sometimes just to cruise around, etc.
Problem is, I have no trailer parks or RV dump stations readily close by and therefore need to "store" waste in the black tank for a few weeks at a time.

Now when I say waste, it isn't much at all - generally just my woman and I, perhaps 1-4 uses a weekend. I make sure to dump a lot of water in and ensure that the toss in chemical pack is in there as well.

How long can I keep this up? Obviously if I have more people using it I would make the trek and empty, but this does not happen often.

Any help would be appreciated, thank you and Happy RV-ing.
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Old 05-08-2015, 04:19 PM   #2
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Until it's full. It's a holding tank, that's what it's made for.
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Old 05-08-2015, 04:20 PM   #3
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Generally speaking, I don't empty the tank until it's 2/3's or so full. I find that the force behind the gravity feed doesn't always move all the solid waste out of the tank otherwise. I've got no evidence to back this up, but I'd also believe the longer the chemical packs have to work on the waste, the less solids there will be when it's time to dump.

That said, if the RV isn't going to be used for more than a couple of weeks I will dump it regardless just to avoid any unpleasant odors if the bowl doesn't seal right or something like that.
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Old 05-08-2015, 04:23 PM   #4
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Agreed, almost full, or if it smells due to a poor seal or something.
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Old 05-08-2015, 04:36 PM   #5
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I all depends on different things. When I was in Arizona this spring for two months and would drain it at about 2/3 full. One night we had a bad order in our RV. It was so bad that we couldn't sleep. Found out that the black tank started to brew with the 80-90 degree days we had for the past week. Drained the tank at 1am and able to sleep the rest of the night.
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Old 05-08-2015, 04:41 PM   #6
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As above, drain it when it starts to smell.
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Old 05-08-2015, 04:46 PM   #7
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Use your gray tank to back flush and clean your black tank after you have emptied your black tank first.
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Old 05-09-2015, 03:13 PM   #8
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Where do you guys dump your black waste, in NZ we have to locate dump stations to hook our hoses up, I suppose in the states it my be a few miles to find one,
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Old 05-09-2015, 03:25 PM   #9
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The city waste treatment plant is 5 miles away, county fair grounds has two and is 10 miles away, Pilot TS is 15 miles out.

I dislike the idea of letting the waste settling in the tank so I use one of the above before unhooking the lite.

When camped I dump it when it is about 3/4 full.
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Old 05-09-2015, 06:36 PM   #10
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I am with elind. If the weather is warm/hot i would make sure there was enough water in the tank. Would not want it to evaporate and leave chunks in the tank.
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