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Old 06-16-2016, 10:50 PM   #15
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Grey tank open at FHU

Leaving the black tank valve open is just asking for trouble. It is a recipe for disaster and a universal no-no, for a host of reasons.

The black tank needs WATER and lots of it, to keep the tank clean and the solids in suspension. Letting the black tank dry out will cause whatever solids left in the tank to turn to concrete...or something similar. Then you've got big trouble.
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Old 06-16-2016, 11:00 PM   #16
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Quote:
Originally Posted by Dr4Film View Post
When closed until full all of that "stuff" get flushed out with the "whoosh" factor while using the 3 inch dump hose.
We have both the 3" slinky and a SaniCon. I really don't like the SaniCon as it doesn't have that "whoosh" factor. I think that's why there's a build up in the black tank from the previous owner. Hopefully putting some water and septic tank treatment in and leaving it for the last 6 months will clear the tank out as we drive over the 4th of July weekend. Didn't plan on it being 6 months but the DW's health didn't allow travel.
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Old 06-17-2016, 12:55 AM   #17
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X2 on keeping black valve closed. If you want to leave the grey open a trick I was shown some years ago was to droop the flex hose down making a "P" Trap. As someone else mentioned you have p traps on all the sinks, etc but that will not limit gases from coming into the gray tank. This hose P trap works to eliminate gas traveling into your tank.
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Old 06-17-2016, 03:40 PM   #18
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Thanks for all the info. I always keep the black tank closed just didn't want to go out after DW takes a long shower to dump at 10:00 at night
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Old 06-17-2016, 04:02 PM   #19
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You can always mount an electric valve on the grey tank with a remote switch in the bathroom. . . . . . .
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Old 06-19-2016, 10:41 PM   #20
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I read somewhere (I think on IRV2) about someone that left the grey valve open at the wrong campground that had a plugged sewer pipe downstream. Everything from every RV uphill ended up flooding their RV.


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Old 06-20-2016, 11:17 AM   #21
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Regardless of where we're parked - we only open the holding tank valves (black and/or gray) when it's time to dump. With two of us, both showering every day and doing a load or two of wash - that works out to dumping everything 3rd day or so. It's a minor inconvenience that requires little more than a couple of minutes ... and that we take in stride, simply chalking up to being part of the whole RV experience.
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