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Old 06-12-2016, 08:04 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, 08:06 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, 08:12 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, 08:19 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, 08:35 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, 08:43 PM   #6
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Originally Posted by JJ77 View Post
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, 08:54 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, 09:03 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, 09:04 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, 09:14 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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