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Old 08-20-2015, 11:15 PM   #1
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To Dump Or Not Dump

I know I've seen this somewhere on the forum but I just can't find it. Why is it NOT a good idea to keep the drain valve for the black tank open all the time when hooked up to sewer?

Doug
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Old 08-20-2015, 11:21 PM   #2
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I know I've seen this somewhere on the forum but I just can't find it. Why is it NOT a good idea to keep the drain valve for the black tank open all the time when hooked up to sewer?

Doug
From the owner's manual:

"The dump valves should remain closed even if connected to an exterior sewer hook up. For proper dumping, empty tanks only when they are nearly full. The idea is to send a large volume of water through the tanks and hose at the same time to assist the solid waste in flushing from the system. Otherwise solids may build up and harden inside tank"

-Dave
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Old 08-20-2015, 11:42 PM   #3
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I know I've seen this somewhere on the forum but I just can't find it. Why is it NOT a good idea to keep the drain valve for the black tank open all the time when hooked up to sewer?

Doug
Because the low flow rate would allow the solids to settle out and build up in the hose. Better to release a gush of water to wash the solids though without them settling out.

Ron
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Old 08-21-2015, 12:20 AM   #4
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Because the low flow rate would allow the solids to settle out and build up in the hose. Better to release a gush of water to wash the solids though without them settling out.

Ron
That, and, have you ever looked down the hole in an outhouse?
Generally it is an ever increasing pyramid of brown.
The water in the tank allows the brown to move around and start the digestion and liquefaction of the brown.
Then the gush of water will have something in it....
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Old 08-21-2015, 05:49 AM   #5
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Not only don't open the valve until you need to dump, but also start out using the toilet/tank with water in the tank (and chemicals if you use them). You don't want stuff to stick to the bottom of the tank.
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Old 08-21-2015, 10:04 AM   #6
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And for a tidier campsite, I (like a few others), prefer to leave the sewer hose put away, until it is needed. Often this is just once at the end anyway, and even if you dump a couple times, it is real easy to set up.
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Old 08-21-2015, 10:52 AM   #7
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We leave our gray tank partially open when we are hooked up. We use the gray tank a lot for dishes, showers etc. Then we close it the day before we leave so we'll have lots of fluid to rinse the hose.
Kathie
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Old 08-21-2015, 11:35 AM   #8
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We don't go #2 in our black tank (if we can avoid it) so there's no issue with the "browns" but I can see the advantage of having a large flow all at once to clean out the hose and the tank at the same time. Thanks for the replies.

Doug
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Old 08-21-2015, 11:37 AM   #9
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We don't go #2 in our black tank (if we can avoid it) so there's no issue with the "browns" but I can see the advantage of having a large flow all at once to clean out the hose and the tank at the same time. Thanks for the replies.

Doug
Thanks for sharing.
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Old 08-21-2015, 12:36 PM   #10
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You really want to avoid the "pyramid of poo" on the bottom of the black tank. We always "charge" the toilet by putting in a couple gallons of water and powder before the first use. We then only hook up and dump when needed. We never leave the hose hooked up the sewer connection when not in use, just personal preference.
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