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Old 04-25-2013, 12:27 PM   #1
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black and gray tanks

So, we are going on our first ever shake-down trip! Got our check lists and probably way more stuff than we need. question! do you hook up your sewer hose when you set up and open valves or wait until you get ready to leave to dump tanks. What is thr right sequence? gray empty and close valve or vs versa thanks
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Old 04-25-2013, 12:29 PM   #2
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Originally Posted by bandit9077 View Post
So, we are going on our first ever shake-down trip! Got our check lists and probably way more stuff than we need. question! do you hook up your sewer hose when you set up and open valves or wait until you get ready to leave to dump tanks. What is thr right sequence? gray empty and close valve or vs versa thanks
Dump when full only.
Dump Black first then close then dump gray.

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Old 04-25-2013, 12:41 PM   #3
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I would say that it depends on how long you're staying in one spot. I hook up the drain hose and then open up the gray water. A couple of days before dumping the black water, I close the gray water valve. That way there's gray water to rinse the hose with after dumping the black. The shower is used every day so there's always gray water to rinse with. Just make sure you use plenty of water when you flush the toilet. You'll get used to not looking at the lights to see where the level is at. Watch out for the bubble when you flush and that will indicate it's getting close to dumping. Have fun and enjoy.
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Old 04-25-2013, 01:36 PM   #4
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I do basically like pipeman says.

More times than not, I hookup sewer right away because we shower in our camper and 3 1/2 people showering fills the gray tank pretty quick (like 1 day).

I am about 50/50 on leaving my gray tank handle open to allow my gray water to run down and out. When I know I'm going to be dumping, I close it with enough time to fill the gray tank (couple of showers, or day or so with our galley sink). I have 3 gray tanks and the 3rd one is my outdoor kitchen all by its lonesome-self - that one, I normally have to let the tap run for 10-12 minutes to fill. Waste of water, but what can ya do.

When it's time to dump - I'll pull my black handle and let the "stuff" fly. Once it's empty, I'll turn on the hose to the black tank flush (or for our 1/2 bath, I'll go run the sink/toilet). I let it run with the handle open for a little and then I close the tank again and let the tank fill up with clean water for a bit (3-4 minutes for the tank rinser and 6-7 minutes for the sink/toilet running). I'll pull the handle and dump it again. I usually "flush" the tanks 2 or 3 times. I have clear elbows that let me see how the water is running and my goal is for "pretty clear".

Once I'm happy with the black tanks, I'll then dump the gray tanks. I only ever do one handle at a time and let it completely finish before going to the next.
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Old 04-25-2013, 01:56 PM   #5
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thanks for your imput it is certainly appreciated. We are really excited! Will have our computer with us so we may be calling for help Thanks again
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Old 04-25-2013, 02:11 PM   #6
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Before I dump the black for the first time, I pull the handle for the gray and let a gallon or more of the gray drain. That way I know if the connections are secure.

Also, before hooking up to the campground septic pipe, I do a check down the pipe to look for any visible obstructions. I started doing both of these things (checking the pipe, and dumping a small amount of gray first) after being sprayed by black water on a camping trip. Someone before me had dropped a ball down the pipe, I didn't know about it, so when I went to dump..... If I had let a little of the gray down first, I would have had gray over me instead of black.
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Old 04-25-2013, 02:39 PM   #7
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Dump when full only.

Dump Black first then close then dump gray. Turbs
I do like Turbs. Sometimes partially dump a gray if I'm a day from check-out to reserve a little for final day flush-out.

I do not open my gray and leave open. It's not the odor thing like a friend suggested... I've watched some interesting things crawl out of a CG sewer connectiion. Rather they be knocking on my grey door than just crawl right on in open.
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Old 05-02-2013, 08:48 PM   #8
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Who back flushes their black tank with the grey water once the black tank is empty.

I find if I empty my black tank (keep black tank valve open) than close the main valve and open the grey tank it will fill the black tank. This helps in getting more out of the black tank.
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Old 05-02-2013, 09:10 PM   #9
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Who back flushes their black tank with the grey water once the black tank is empty.

I find if I empty my black tank (keep black tank valve open) than close the main valve and open the grey tank it will fill the black tank. This helps in getting more out of the black tank.

Most of us have 2 valves only. One for black and one for grey and those feed into one going out. No way to back flsuh black tank with grey.
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Old 05-02-2013, 09:22 PM   #10
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It could be a very bad idea to introduce gray water into the black water tank for flushing, because there is a chance you could get black water into your gray water tank. You treat your black water tank with chemicals, but not your gray water tank. If you get black water into your gray water tank, you are asking for trouble, as the bacteria starts to grow unabated.

JMHO, Forrest
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