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Old 05-04-2016, 05:14 PM   #1
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Grey water tank flush

Just bought a 2014 winnebago aspect 27K. Planning atrip end of this month and was reviewing manual on how to dump grey water tank. What got my attention is that i can't flush the grey water tank without opening the black water tank first. There is a drain pump switch tha must be turned on in order to flush the best I can tell. Question is when camping can i just open the grey water tank and the water goes straight to the campground sewer or do i have to to monitor the level and drain it with switch. I had a 2012 coachman concord and only ppen the grey water tank valve and didn't worry about the tank it drain straight into the sewer. I only open the black water tank when it was fulled. Any tips appreciated. Thanks

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Old 05-05-2016, 05:00 AM   #2
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Most of us use the gray water for assisting of flushing out the waste water tube.

The extra help in the flush is accomplished by holding some water in your gray water tank, and after dumping your black tank, close the black and then dump the gray.

Gray water is much cleaner than black water and the rush of it flowing through your hose will most likely not leave you with a smelly mess in your drain hose to clean out after you've finished your dumping operation.

How much gray water you leave for that last flush is a matter of trial and error. Most would wait until the gray is almost full to get the full benefit, or just fill the gray then dump the tanks if in a camp site that has water hook ups. If you have a black tank rinse system, use it while you are draining the tank.

The object is to rinse as much debris out of your hose as possible in the shortest amount of time.

hope that helps

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Old 05-05-2016, 05:07 AM   #3
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Normally you could open the grey tank and let the soapy water just drain out. The pump is used if the tank cannot flow downhill to the termination port. It may not drain with the pump in the circuit without it being turned on. There should be a valve for the black tank that can be left closed and try allowing grey tank to reach a level to push any additional liquid out.
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