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Old 09-04-2014, 09:07 PM   #1
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Trailer stays on site

I leave my zinger at the park a month at a time, when using the rv do you leave the black and grey open all the time?
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Old 09-04-2014, 09:14 PM   #2
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Never leave the black open. The liquids run out and there is not enough water to flush the solids. It's OK to leave the grey open however. A day or two before you dump, close the grey tanks and then use the grey to flush out the hose after dumping the black.
Stan and Terri
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Old 09-04-2014, 09:18 PM   #3
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No. You must have a volume of black and gray water to flush the tanks out properly. Leave them closed until they are nearly full, then dump, black first, then the grays. If you have a black tank washer use it. Flush the gray tanks with running water. Finally, fill the black and gray tanks with a few gallons of water to keep the seals from drying out and any remaining sludge from hardening. If you don't know about the geo method for cleaning, here is a link:
Even though you do not travel with the camper often, the geo method will help keep the tanks clean.
Mark & Susan
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Old 09-05-2014, 09:43 AM   #4
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All good info above. If you do leave gray tanks open create little P trap in your sewer hose so you don't exhaust sewer gases off your roof top. That won't make you friends if you are parked for a month. Just let the hose drop down to make a u shape loop that will hold water like a p trap.
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Old 09-05-2014, 10:03 AM   #5
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We leave ours seasonal all year. Gray is always open with a garden hose "cap" and garden hose going into gray drain (we don't have sewer).

We don't have a "trap" in hose, and no odors from gray tank (dunno about it with normal sewer hose).

You should follow advice - do NOT leave black open. We dump at 2/3 or full, and I send 3 buckets of water down after draining to "rinse" and help prevent the almighty pyramid. Every other drain I use the magic wand.

If odor is strong, fill black tank up with water before you dump so it is a full tank. We are on 4 seasons, and I haven't had any issues.
Eddy & Brenda
Canton, OH
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