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Old 02-16-2016, 04:49 PM   #1
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Being effective and efficient at the dump site?

Typically at a full hookup site, on the last day of a trip, I will fill and flush the black tank a couple of times to get it as empty of "remains" as I can. Using the external "black tank flush" hookup is a pretty slow process.

This year we will be ending the trip at a no hookup site. So the odds are I'll be low on water and energy. I really don't want to block the single dump site for a pretty long time filling and flushing the black tank (even if it is only once).

If lucky, I might be close enough to run a hose from the communal campground tap before we leave our site. But otherwise, all I can think of is to haul jugs ahead of time, and dump them down the toilet, run a hose from the fresh water at the dump station into the toilet to fill the tank faster, or to just make all the other RV's wait while I use the external flush.

Any words of wisdom on how to accomplish the deed in a minimum amount of time, that still gets most of the nasties out?
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Old 02-16-2016, 05:04 PM   #2
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Get what you can out, then add 5 gallons of water or so, and find a dump station on your way or closer to your home. The agitation of the water will help break up any solids left in the tank. You will be surprised how many gas stations etc have dump stations, many times at no cost.

Good Luck.
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Old 02-16-2016, 10:45 PM   #3
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I always try to leave water "sloshing" on my last trip, on the drive home, then I have a place close to the house where I do my final rinse and flush for the season. Check this website for a dump location close to home....
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Old 02-17-2016, 08:00 AM   #4
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The dump station at a state park or similar CG is not intended for a "full rinse", and should just be used to empty your tanks. If you leave mid week [advantage #12 for being retired] maybe rinse and flush to your hearts desire, but other wise I like the above suggestion. Dump and use the dump station hose to shoot 4 or 5 gallons of water into the black tank. Many states now have dump facilities at rest areas so you can stop at one of them after driving several miles on the way home. The sloshing is way more effective than just multi fills and flushes.
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Old 02-17-2016, 09:34 AM   #5
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We usually don't dump when leaving but wait until we get home. Our town has a dump station that can be used for free, so far. That way, the stuff in the black tank will slosh around and hopefully will empty a little bit cleaner than if we had dumped at the campground. We generally also do not put fresh water in the tank until we arrive at the campground, but that's a personal preference, we don't do it to save weight.
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Old 02-17-2016, 09:42 AM   #6
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Black tank flush is quick, efficient, and effective for me.
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Old 02-17-2016, 01:47 PM   #7
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I try my best to be at the dump station when no one else is there. That way I can get at least one flush. I also try to have the tank as full as possible before I get there so I don't have to run water in it to get a good flush.

If the line is backing up, I'll do a quick flush (of a full tank) and add in 5-6 toilet bowls of water and treatment. It will slosh around in transit and hopefully pull most of the leftovers down into the liquid and dissolve over time. It's not ideal, but I'm hoping I'll be able to get a good flush at my next destination. Worst comes to worst, and I absolutely have to flush it out, there are a couple RV parks close to home, and a truck stop where I can dump for a small fee. I haven't had to do that yet, but it's in my back pocket if I need it.

ETA: You might try putting a cup of Calgon in the tank at the beginning to help all the "stuff" get out in one swoop if that's all you get. Add some more with water after so the leftovers will move easier.
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Old 02-18-2016, 06:49 AM   #8
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Here's what I do when dumping at a dump station:

First I try to get to the dump station when it's not busy.

Once at the dump station.
- Connect the hose to the black tank flush.
- Run the black tank flush while dumping the black tank.
- Once the black tank drainage is down to just the the black tank flush water
- Close the black tank valve (to add rinse water via black tank flush)
- Dump gray tank(s)
Note: Watch the Black Tank Level during dumping the gray tank to make sure you don't over fill the black tank. Though this has never happened to me.
- After gray tank(s) have dumped, dump the black tank's rinse water.
- Once the black tank drainage is down to just the the black tank flush water
- Turn off water & replace dump station hose.
- Allow black tank to finish draining during replacing the dump station hose.
- Close black tank value & pull out of the dump station (if someone is waiting).
Then, when I'm out of the way
- I add ~1-2 gal water and toilet chemicals to black tank, put both in via the toilet. I keep this water-chemical mixture in the black tank until the next camping trip.

During the camping season I always keep ~1-2 gal of water & toilet chemicals in the black tank. I've done this with all the trailers we've owned over the past 15+ years. Between sloshing around when driving and sitting during storage, it has always seemed to help keep the black tank clean. If it's a while in-between camping trips I may dump what's in the black tank once I get to a campground then refill with new ~1-2 gal of water & chemicals.

I only drain the black tank to totally dry on the last trip of the season prior to winter storage. I always try to camp at a full hook-up site for the last trip of the season so I can take my time and clean all tanks out very good.

Hope this helps.
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Old 02-18-2016, 07:34 AM   #9
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When there isn't a good flow ow flush water available, or when the hose threads are cut off or damaged, I usually put a removable slide gate on my discharge pipe before I connect the hose. This allows me to dump black tank, close removable gate and open both black and grey valves. This pushes grey water into the black tank. Close grey, then open removable gate to drain black again, then close black and open grey to finish draining it, and the grey flush "flushes" your dump hose. Not the best way to do it, but it works when flush water or a lot of time isn't available.
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Old 02-18-2016, 06:52 PM   #10
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Quote:
Originally Posted by Camper_bob View Post
I also try to have the tank as full as possible before I get there so I don't have to run water in it to get a good flush.
I do the same thing. Anything you can do before the dump station (especially on a Sunday afternoon) really helps out. We try and use the campground facilities as much as possible so we don't accumulate much in there. One thing we've gotten in the habit of doing is dumping our dirty dish water down the toilet which has the added benefit of not filling up the grey tank. I'll make sure on the last morning before we leave to flush the toilet a few times then on the way to the dump station I'll make sure to slosh it up as much as practical. Saves some time and I think the fuller the tank the better the flush.
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