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Old 06-14-2016, 10:18 AM   #1
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Newbie - Simple question

Hi there,

First time going a full hookup and I'm not sure about one thing and getting conflicting info out in the Google world.

When I hook up to the sewer do I wait for my tanks to be almost full before opening the valves or do I just leave them open all the time as soon as I get there?

Thanks!

Keith
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Old 06-14-2016, 10:22 AM   #2
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Never leave your black tank valve open. You'll get what they call the brown mound. Dump when full.
Differing opinions on grey tank valves. Some leave them open. I keep 'em closed until I need to dump.


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Old 06-14-2016, 10:24 AM   #3
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Originally Posted by kthoms View Post
Hi there,

First time going a full hookup and I'm not sure about one thing and getting conflicting info out in the Google world.

When I hook up to the sewer do I wait for my tanks to be almost full before opening the valves or do I just leave them open all the time as soon as I get there?

Thanks!

Keith
Leave your black tank closed until its full. You need the volume to force the flush. If you need to dump before the black is full, fill it up the rest of the way with water first.

As far as the grey goes, it's a matter of opinion. Depending on how large your grey tank is and how many people are traveling with you, the grey could fill up on you pretty fast especially after showers. Personally, I like leaving the grey open at the site but others will tell you that leaving the grey valve open will allow the sewer to vent through your drains into the camper. I just make sure that I run some water down all my drains so the traps are full of water.
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Old 06-14-2016, 10:31 AM   #4
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I keep the black water tank closed until full and then dump. I keep the grey water tank(s) closed until full, then dump as needed....but always have a full grey tank to "flush" out the hose after the black water tank dump. I use one small bottle of black water tank treatment each time, and upon departure, put 5 gallons of water into the tanks, to slosh about and keep solids in suspension.
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Old 06-14-2016, 10:42 AM   #5
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I agree with the group, keep the black closed. Not to mention if the black valve were open and on a chance the sewer drain would come off or out of the drain hole, the mess would be everywhere but where it should be.

Kevin
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Old 06-14-2016, 11:18 AM   #6
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OK black shut for sure until full, grey I'll shut until half full I guess, I can see the need to use the grey after the black
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Old 06-14-2016, 02:03 PM   #7
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Gray Tank

The reason some people choose to keep their gray open is so they don't wind up standing in 3 inches of water when they take a shower and their tank is full. Keep an eye on your gauge and if necessary dump before taking a shower and you should be set. If you don't use your RV shower like some people then it can really take a couple of days or more to fill your gray depending on your water usage and how many people you have.
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Old 06-14-2016, 02:05 PM   #8
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Black Tank Flush

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Originally Posted by kthoms View Post
OK black shut for sure until full, grey I'll shut until half full I guess, I can see the need to use the grey after the black
If you have one, get in the habit of using it to fill the black tank prior to dumping it. I also use the GEO method in both of my tanks. Google it and you'll see what it is. Since I've started using the GEO method, I've had no false sensor issues. Welcome to the forum.
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Old 06-14-2016, 02:27 PM   #9
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With full hook ups,I leave the gray open until the night before we leave. We both take showers and have enough to flush the hose when I dump the black. Galley tank stays closed just because it'll hold several days of dish washing.
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Old 06-14-2016, 02:32 PM   #10
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Black always closed until full. Grey depends on whats going into it. If dish water with food particles then closed as well until almost full. If only liquids (no food particles) then either option it's up to you.
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