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Old 06-16-2013, 08:25 PM   #11
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The thread I started is now on page four near the top of the page.

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Old 06-16-2013, 08:52 PM   #12
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The way to clean out the black holding tank is to dump then close the valve and allow the cleanout input (water) to almost fill the tank (watch your level indice for the amount in the tank). This will take sometime because the spray nozzle in the tank typically has small holes. Open the valve with the input still flowing and if you have a clear adapter at the discharge you will see if the procedure should be done again. If not then a couple times of refilling and draining will probably sufice. The black tank is VENTED TO THE OUTSIDE and therefore no tank expansion will occur. There will be no damage to the tank. Typically, when you are finished and have closed the valve for the last time and shut the water off and disconnect the hose there will be residual water in the line from the input side of your unit backflow preventer. This water is not coming from the black tank. This water is from the closing of the backflow preventer. Another thing, your backflow preventer is typically mounted high above the black tank and this perhaps would suggest the backflow preventer may not even be needed.
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Old 06-16-2013, 09:11 PM   #13
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The way to clean out the black holding tank is to dump then close the valve and allow the cleanout input (water) to almost fill the tank (watch your level indice for the amount in the tank). This will take sometime because the spray nozzle in the tank typically has small holes. Open the valve with the input still flowing and if you have a clear adapter at the discharge you will see if the procedure should be done again. If not then a couple times of refilling and draining will probably sufice. The black tank is VENTED TO THE OUTSIDE and therefore no tank expansion will occur. There will be no damage to the tank. Typically, when you are finished and have closed the valve for the last time and shut the water off and disconnect the hose there will be residual water in the line from the input side of your unit backflow preventer. This water is not coming from the black tank. This water is from the closing of the backflow preventer. Another thing, your backflow preventer is typically mounted high above the black tank and this perhaps would suggest the backflow preventer may not even be needed.
Caveat Lector in this case. There are warnings on the camper itself (stickers) and the truboflush manuals not to use the system with the dump valve closed. You, of course, are free to do what you want with your camper.

As to the backflow preventer, there is the Venturi effect to consider. Air flowing along the camper wall will produce a low pressure at the opening of the inlet. This low pressure would suck out the black tank water if a vacuum break was not installed. This effect is seen more often at the gravity fill port on the fresh water side when campers depart with a full tank and yet arrive at their campground with half their water gone (sucked out of the vent line, also above the tank).
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Old 06-16-2013, 09:11 PM   #14
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I have one of these and can easily see after a few full tanks and flushing it is clean inside.
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Old 06-16-2013, 09:16 PM   #15
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We really are enjoying our new 335 ds, but one mystery still eludes us - the black tank rinse.
I empty the tank, leave the valve open, connect the hose where indicated, turn on the water and await the "rinse". No water flows in or out. What am I doing wrong?
Lots of good hints here, however I have to agree with (?) post #8 plugged tank nozzle. It should be obvious sound and hose that mucho water is entering the tank. It sounds new, should have dealer unplug it next trip in for warranty repairs. If the vac valve were bad, you probably would have water all over the compartment its located in.
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Old 06-17-2013, 07:32 AM   #16
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Google "how to clean rv black water holding tank" and watch one of the available video's.
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Old 06-17-2013, 08:09 AM   #17
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If you turn on the flush hose and close the black dump valve and forget it the water comes out the roof vent and runs on top of your head!!

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Old 06-17-2013, 08:21 AM   #18
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Like I said, tank is vented and therefore closing the dump valve while hooked up to cleanout is not an issue. If your driving your MH down the interstate and decide to go get yourself a cold drink from the fridge...
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Old 06-17-2013, 08:32 AM   #19
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If you turn on the flush hose and close the black dump valve and forget it the water comes out the roof vent and runs on top of your head!!

Jack
It will sure guarantee making sure your toilet is not leaking anywhere and maybe some other places you don't expect.
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Old 06-17-2013, 08:38 AM   #20
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I have a friend (Former O-6 C-130 Navigator and Astronomer) who routinely used BUBBLES technique for flushing when in full hookups (after weeks in dry camping) at Navy Key West.

He was called away "momentarily" by a neighbor while the tank was filling and when the tank filled water (mostly anyway) filled the vent stack and was running on the roof. The problem came when the stack filled and the incoming water had to push against the water filled vent. His tank burst and the repair cut short his winter vacation.
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