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Old 06-12-2016, 07:04 PM   #1
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Black tank doesn't empty 100%

I have a 291bhss. The black tank never empties. I have to shove a hose up through the exit pipe and blast water through to get it to release the poo! Not sure if I'm the only one having this problem. I doubt it due to the lack of quality in my camper. Everytime I take it out I have to get my toolbox out. Thinking about cutting the pipe and adding a different clean out that will actually dream. Just curious about the only one experiencing this. I doubt it. It's one thing after the other with this camper. I expect problems but it never ends. Thanks
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Old 06-12-2016, 07:06 PM   #2
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And let me add to the subject that I have a black tank flush. But it is pretty much useless. Not sure how it spreads internally? I'm pretty sure it just dumps fresh water into the black tank
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Old 06-12-2016, 07:12 PM   #3
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What sort of tank treatments are you using?

I add a scoop of ordinary laundry soap and some water softener (not fabric softener) to my TST treatment (or whatever else I can get at Walmart. This tends to make things slippery and easier to flush away.

Since we carry a bit of laundry soap anyway, the only added expense was the water softener.

A few "lego levelers" under the curb side might make things drain better at dump time.
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Old 06-12-2016, 07:19 PM   #4
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Might try a tank wand or build one out of pvc pipe to put into the toilet and spray around.. The black tank flush I have and had ,have always done their job
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Old 06-12-2016, 07:35 PM   #5
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I would go with a toilet flush wand , sticking a hose up the exit end you are asking for a messy accident waiting to happen.
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Old 06-12-2016, 07:43 PM   #6
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And let me add to the subject that I have a black tank flush. But it is pretty much useless. Not sure how it spreads internally? I'm pretty sure it just dumps fresh water into the black tank
check to see where your black tank flush is installed in the tank,..... if like mine and probably most FR installed tank flushes, it's on the drain side of the tank, just above the drain opening(which IMO is the wrong side),....if so, then if you are spraying while draining, the spray is actually spraying against the flow of water, solids, and paper trying to drain out, ..... when I became aware of this, I stopped spraying while draining,..... now I close drain valve, spray, stop spray, open drain valve,....I do this routine several times and do get good cleaning results
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Old 06-12-2016, 07:54 PM   #7
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Use lot of water on each flush. Water is your friend. If you are at a full hook up site, leave the dump valves closed until the tank is almost full then dump. The force of the rushing water is needed to help push/pull out the solids.
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Old 06-12-2016, 08:03 PM   #8
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Do you have full hook ups at your trailer site, meaning a sewer dump? If so, are you keeping the valve on the black tank drain closed and only draining when the tank is nearly full? This gives the water and chemicals time to dissolve the solids so they can flow out.
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Old 06-12-2016, 08:04 PM   #9
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Use lot of water on each flush. Water is your friend. If you are at a full hook up site, leave the dump valves closed until the tank is almost full then dump. The force of the rushing water is needed to help push/pull out the solids.
X2, when you are done using the toilet, fill the bowl the rest of the way with water and flush. Fill the bowl again and flush. Always wait untill tank is full before draining.
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Old 06-12-2016, 08:14 PM   #10
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Why do you think its not draining completely? I hope you are not relying on the indicators. They are notorious for for being inaccurate.
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Old 06-12-2016, 10:23 PM   #11
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Here's what's happening in a nutshell. I keep black tank valve closed until leaving. Indicator is stuck on 3/4 full since new. I open the valve until nothing flows. I use my tank flush until I can see water through my toilet opening. Dump again. When get home I open the valve with a bucket under the drain and always get a bucket full of solids. It's like the drain is higher than the bottom of the tank. I will try adding some chemicals to see is it helps. I haven't been using any chemicals due to short weekend trips. Lots of campers told me they don't bother with chemicals so I quit using them.
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Old 06-13-2016, 12:22 PM   #12
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I always start with 3-4 gallons of water in the black tank at the beginning of the trip. It is supposed to help loosen up anything that may be stuck in the tank from previous trip.
Maybe you need to modify your diet.
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Old 06-13-2016, 12:24 PM   #13
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After draining the black water tank I fill a bucket up with fresh water. Dump that in the tank and open the valve again. I always use some type of treatment for the black water tank.
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Old 06-13-2016, 12:48 PM   #14
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Maybe you need to modify your diet.

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Old 06-13-2016, 01:09 PM   #15
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I would think with all the beer I drink while camping there would be enough liquids in there to keep things flowing! Diet? what color is it now?
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Old 06-13-2016, 01:17 PM   #16
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I recommend not relying on the indicators, just as a guide. The indicators in my 3200BHT have read 3/4 full since we brought it home new from the dealer. When it drains at first, it'll read empty and then one flush read 3/4 full and then full. I leave my valves closed and drain it every other day while staying at the CG. I then drain it and use the black tank flush as well. I run that a few times until the water comes out "clear" and then eventually stops.

Why do you think it's not emptying 100% outside of the indicators?
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Old 06-13-2016, 05:55 PM   #17
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Try this black tank treatment, it is the best that I have used. No odor and breaks down the solids.
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Old 06-13-2016, 06:27 PM   #18
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X2 on Happy Campers. Used that in the last three TT and no issues.
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Old 06-13-2016, 07:33 PM   #19
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X2 on Happy Campers. Used that in the last three TT and no issues.
Same here.
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Old 06-13-2016, 09:14 PM   #20
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Cutout. Maybe the cutout from when they cut the hole in your tank is still in the tank. Many have had this happen. Search the forum for this.
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