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Old 08-01-2016, 10:10 AM   #1
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How do you clean out your black tank when there is no water hookup

I am a newbie and would like to know after dumping my black tank how I clean it out if there is no water hookup. I have flushing system but many dumping stations at state parks don't have a place to hook up a hose. What do you do then?
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Old 08-01-2016, 10:17 AM   #2
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If there's no water, you can't flush with water. Some parks have non-potable water for flushing but they may not have a screw on hose, in which case you need a universal adapter. Really wish public parks and rest areas would do more to update their campgrounds and dump stations.
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Old 08-01-2016, 10:19 AM   #3
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I took the sprayer head off of my outside shower, and bought an adaptor at Home Depot, and now I use my outside shower hose to connect to my black tank flushing system.
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Old 08-01-2016, 10:21 AM   #4
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If you have water in your tanks ,you can fill the black tank via flushing. Close the valve after you dump , fill the tank from on board water and dump again .
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Old 08-01-2016, 10:27 AM   #5
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Well, you may have one alternative. Empty your remaining fresh water into your black water tank. You could use the water pump to do the transfer or a bucket under your fresh water tank drain and dump that down the commode. That won't flush it but it will help get a lot more of the poo out.

I have the luxury of having access to my sewer clean out at home. I can flush to my hearts content. You may have a similar option and just not know it.
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Old 08-01-2016, 10:38 AM   #6
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I hope this is a one or two time thing for you, and that you do have city water available now and then.

One thing I normally do is drain the black tank, then leave the black tank valve open. Pull the gray tank for a few seconds to allow gray water to flow into the black tank. I usually elevate the hose to force more gray water into the black tank.

Then close the gray valve and let the black tank drain again.

Finally, close black tank valve a drain the rest of the gray tank.

Always have a min of 3/4 level in black tank when draining.

Other tips - if you have a macerator toilet, use it for the #2 events.
Also ask the DW to put TP in the trash instead of flusing it.

Regards,

Dan
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Old 08-01-2016, 10:47 AM   #7
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Opening the grey and black water drain valves at the same time two or three times after the black has been drained works, but it is not as complete as a black tank flush. I've tapped the water system after the pump so I can connect a hose to run to the black tank flush system, or to use for limited other chores when needed. We boondock a lot, and these two techniques work very well for us.
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Old 08-01-2016, 11:42 AM   #8
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How do you clean out your black tank when there is no water hookup

One does not have to flush/clean the black tank every time you dump. Clean it when water and time are available.
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Old 08-01-2016, 11:49 AM   #9
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Quote:
Originally Posted by vsheetz View Post
One does not have to flush/clean the black tank every time you dump. Clean it when water and time are available.

Correct!


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Old 08-01-2016, 12:54 PM   #10
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Back wash works but trying your outdoor shower hose with the onboard pump
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Old 08-01-2016, 03:35 PM   #11
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Quote:
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One does not have to flush/clean the black tank every time you dump. Clean it when water and time are available.
I second this!

Like dpinvidic, i make sure gray has plenty of water in it before doing anything. I drain black first then after it stops, open the gray and let it go into the black so that i can do a second smaller dump. I do make sure to close the gray before everything starts to mix and flows back into it. Gray and black are both 3 inch and piped straight across from each other. Make's it easy.
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Old 08-01-2016, 04:48 PM   #12
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One does not have to flush/clean the black tank every time you dump. Clean it when water and time are available.
Thank God someone said that!
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Old 08-01-2016, 04:59 PM   #13
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Fill toilet, flush toilet, repeat.
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Old 08-01-2016, 05:24 PM   #14
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Quote:
Originally Posted by vsheetz View Post
One does not have to flush/clean the black tank every time you dump. Clean it when water and time are available.
Quote:
Originally Posted by DebnDan View Post
Correct!


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Originally Posted by dexters View Post
Thank God someone said that!

They are HOLDING tanks.

Dump when 3/4 or more full
High liquid level to solids ratio
Liquids are heavy and the high volume carries the solids OUT

(fast moving river moves boulders------slow moving creek can't budge a pebble)

After a few gallons (full toilet bowl flushed twice) back into tank so bottom stays wet and nothing dries out and sticks (or stinks)
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