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Old 11-29-2015, 06:18 PM   #1
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Sewer valve,opened or closed

When you have your sewer hose connected to the sewer pipe do you have your valves open or closed.I leave mine closed but the last CG we were in I was shocked how many people leaves there's open.Is there a right way and a wrong way?
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Old 11-29-2015, 06:21 PM   #2
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Closed here. Better for solids to swim than beached..........
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Old 11-29-2015, 06:26 PM   #3
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Black tank should be closed until at least full, then dumped. Some rigs, like ours are supposed to have the gray open when using the washer, but otherwise closed till needing to dump.
Evidently the previous owner of our rig didn't know the proper care of the black tank so I'm still trying to get all the poo pyramid out.
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Old 11-29-2015, 06:26 PM   #4
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You're probably seeing the gray water valve open. If you do this, it's best to create a water trap in the hose (just like the one under the sink) to keep sewer flies from traveling up the hose and taking up residence in your gray tank.

We keep ours closed, black and gray, until we are ready to dump.



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Old 11-29-2015, 06:26 PM   #5
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sewer valve

closed until 1/2 tank or more. then ok to dump. also less chance for gas to backflow into tanks, smelling up rv.
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Old 11-29-2015, 06:27 PM   #6
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We keep both our our valves closed. Black tank needs lots of water to keep sensors from getting fouled. Grey tank in order to flush after dumping black tank.

Also keep valves closed to keep sewer lines from venting through the tanks and out the stacks on the coach. Do not want the venting near us on the patio. Some folks leave a dip in the stinky slinky to prevent back flow of sewer gas but I think the valve is much more dependable.
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Old 11-29-2015, 06:29 PM   #7
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Old 11-29-2015, 06:31 PM   #8
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I keep the black tank closed until time to dump and flush. I always make sure after dumping that there is water in the bottom of the tank to prevent particulates from sticking/accumulating on the bottom of the tank. Another reason to keep liquid in the tank it helps to keep seals moist.

As for the grey tank I normally keep it closed and use it to flush out the sewer line after dumping/flushing the black tank. Keeping liquid in the tank also keeps the seals moist. The only time I open and leave it open is when the wife is doing laundry. I do not want the tank to overfill and come out the washer drain or shower. Once the laundry is done I close the tank.
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Old 11-29-2015, 06:32 PM   #9
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Closed until ready to dump. Exceptions are showering, washing machine, dishwasher usage. Then grey open if likely to overfill the tank otherwise.
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Old 11-29-2015, 06:40 PM   #10
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If either one of them is open aren't you going to have sewer gas come in.
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Old 11-29-2015, 06:52 PM   #11
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Quote:
Originally Posted by stan5711 View Post
If either one of them is open aren't you going to have sewer gas come in.
Between the sewer gas and solids left in tanks and hose, these are good enough reasons to leave the valves closed until it's time to dump.

If I think about it I will open the gray valve before we shower. (And hope I don't forget to close it afterwards.)

Another thing we do is occasionally dump the dishwater down the commode to let soapy water help clean the black tank. (And to help fill the black tank.)
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Old 11-29-2015, 06:59 PM   #12
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Do you put chemicals back in the gray water tank after every dump.
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Old 11-29-2015, 07:19 PM   #13
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I keep every tank valve closed until it's time to dump.
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Old 11-29-2015, 08:10 PM   #14
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Quote:
Originally Posted by stan5711 View Post
Do you put chemicals back in the gray water tank after every dump.
Chemicals in gray tank ? We put deodorizer in black tank after dumping.
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