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Old 05-23-2015, 01:46 AM   #1
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Black tank

My sensors seem to be messed up. I just emptied my tank and it's saying 2/3 full. How do I know when my black tank is full or nearing full? Is there a way to view the tank by opening a compartment?
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Old 05-23-2015, 01:59 AM   #2
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Probably the TP syndrome. Did you flush it after it was emptied? Does it have a flush?
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Old 05-23-2015, 04:28 AM   #3
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Although I'm new to rving, our used trailer has the same issue. A Google search found that this is a very common problem. I installed a flush kit and flushed mine a zillion times. I tried ice, soap, water softener and boiling water. There is a product called Digest-it that is supposed to work pretty good. I haven't tried it. Does the FULL indicator work? Mine does so at least I know when it's full. You will get lots of ideas here. Good Luck
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Old 05-23-2015, 05:49 AM   #4
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Originally Posted by larryo View Post
Although I'm new to rving, our used trailer has the same issue. A Google search found that this is a very common problem. I installed a flush kit and flushed mine a zillion times. I tried ice, soap, water softener and boiling water. There is a product called Digest-it that is supposed to work pretty good. I haven't tried it. Does the FULL indicator work? Mine does so at least I know when it's full. You will get lots of ideas here. Good Luck
Mine are always off and I keep my tank clean. I have figured out that between me and my wife we can make a good 4 days before I have to dump, probably could go 5 but I don't want to talk to it when it starts to come back up when flushing.... By the way I have used Digest-it. It is a good product had some solids that it took care of but had to let it sit for 24 hrs. to break them up. When new I left my black tank open which is a no, no. Blocked it up and used that stuff. Other then that I would be buying a new tank. Rookie lesson learned....
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Old 05-23-2015, 07:27 AM   #5
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Originally Posted by eswan21 View Post
My sensors seem to be messed up. I just emptied my tank and it's saying 2/3 full. How do I know when my black tank is full or nearing full? Is there a way to view the tank by opening a compartment?
Yes, it's the toilet compartment. Step on the flush and look down into your tank. If it's full fluid will be (touching) at the end of the drop zone.
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Old 05-23-2015, 08:05 AM   #6
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I never depend on the gauges. When I start to get an air bubble, when flushing the potty, that's an indication that the black tank is getting close to full. I use RV Digest-it all the time, as well as some laundry detergent and some calgon, either liquid or granule. Some pipes from the toilet are bent, like mine is, so you can't see the tank itself but if the liquid is where you can see it, it sure is time to drop the tank. I also had the mound...twice...not very pleasant work to clear that up when dry camping, as we do. Water is your friend. When hooked up use plenty. When not hooked up, you can extend the flush time by saving the liquid until you get a bowl close to full. Might not be pleasant but it works.
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Old 05-23-2015, 09:58 AM   #7
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My black tank sensor worked very will on my last two 5er's, but I kept the tank clean. When we would break camp my DW and I always cleaned the black tank with extra care. We haven't had the Cedar Creek out yet, this week will be our first time out.


The follow information is my procedure for keeping the tank clean:


I use Calgon water softener powder and Borax Soap mixed together. I use a cup of each mixed in hot water, dump this in to the tank after flushing and cleaning the tank. This helps to keep the tank slipper and clean at the same time.
This will be the first thing we add to the black tank before use.


Now for cleaning; use you black tank flush if equipped or buy a wand that can be placed down the toilet and spray the inside. We will than dump between 4 and 6 gallons of water down the toilet letting this flush any debris that are still in the tank. Tank should be cleaned by now.


You should have a clear elbow connected to the drain line to watch for clear running water from the black tank when you see this empty your gray tanks you are done. This may take up to 1/2 hour to clean but the tank sensors will work.
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Old 05-24-2015, 08:45 AM   #8
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I always make sure there are a few gallons of clean water in the black tank before departing on a trip, That way solids can break up right from the get go. I usually dump every other night when on the road.
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Old 05-24-2015, 08:50 AM   #9
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When my sensors are being stupid, I normally run a BUNCH of water into the tank, then take it to our city campground and dump it (free).
Just driving it over there with all the water sloshing around has always taken care of it for me.
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Old 05-24-2015, 09:14 AM   #10
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Looked this up because I have the same happen when ck even my grey tanks this is what I got.
https://search.yahoo.com/search;_ylt...20black%20tank
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