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Old 07-07-2016, 01:35 PM   #1
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Question Black tank flushing

If you have your water hose attached to the black tank flush, it is turned on, & you have your black tank dump valve closed, shouldn't your electronic fill lights come up as the tank is being flushed/filled? My last trip I wanted to fill the black tank up 3/4 of the way full then open the dump valve to try and really clean tank.This was after I already released and flushed out the system once. The fill light never came over 1 light. Is this normal?
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Old 07-07-2016, 01:45 PM   #2
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Unfortunately it is. The sensors they use in the tanks are very unreliable.

I'd be very afraid to rely on them to tell me when the tanks are full. It could end in disaster.
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Old 07-07-2016, 01:55 PM   #3
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I would use tea leaves before I would use tank level lights to predict black tank contents.

Secondly, there is no chance I would leave the dump valves long enough to go inside and check tank level lights.

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Old 07-07-2016, 02:08 PM   #4
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Some say it's normal, some say it isn't. I'm in the latter camp - Use of the Geo Method with occasional wanding of the black tank through the toilet meant that all of the tank sensors in our last travel trailer were still working properly when we sold it after eight years of use.
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Old 07-07-2016, 02:14 PM   #5
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After our last trip my black tank is reading 2/3 full even though I did empty and flush it out. I don't have a built in black water flush so I use the kind that you connect inline with the sewer hose and then connect a secondary hose to. I was thinking of adding some water and chemicals to the tank before we head out on our next trip to try and clean the sensor and the tank in general. Did this work well for you? anyone else have any luck with this technique?
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Old 07-07-2016, 02:27 PM   #6
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Quote:
Originally Posted by Shawn.O View Post
After our last trip my black tank is reading 2/3 full even though I did empty and flush it out. I don't have a built in black water flush so I use the kind that you connect inline with the sewer hose and then connect a secondary hose to. I was thinking of adding some water and chemicals to the tank before we head out on our next trip to try and clean the sensor and the tank in general. Did this work well for you? anyone else have any luck with this technique?
I also use the geo method and find my sensors are fairly reliable.
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Old 07-07-2016, 02:32 PM   #7
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I also use the geo method and find my sensors are fairly reliable.
I was just reading up on the GEO method, one question, do you still use the typical RV toilet chemicals along with this method or is this a full replacement for those chemicals? I would still think you would want to help breakdown the solids in the tank, not sure if the GEO method would do that?
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Old 07-07-2016, 02:37 PM   #8
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I use 1/2 cup calgon, 1/2 cup Dawn, 1 deodorizer packet (Thetford non-formaldehyde), and 2-3 gallons of water.
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Old 07-07-2016, 02:40 PM   #9
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I use the Black Tank Flush on the side of the TT every time I can. About every 2-3 trips, I'll run the wand down the toilet into the tank to give it a real good washing. After flushing at the campground, I'll leave about 3 gallons of water in the tank with the tank chemical and a capful of Calgon. The solution will slosh around and leave a slick residue on the sides of the tank making it easy for "things" to leave the tank when dumping it.
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Old 07-07-2016, 02:55 PM   #10
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Quote:
Originally Posted by Shawn.O View Post
After our last trip my black tank is reading 2/3 full even though I did empty and flush it out. I don't have a built in black water flush so I use the kind that you connect inline with the sewer hose and then connect a secondary hose to. I was thinking of adding some water and chemicals to the tank before we head out on our next trip to try and clean the sensor and the tank in general. Did this work well for you? anyone else have any luck with this technique?
Unless your drain has a straight line into the tank (pretty rare as I understand it), back flushing the black tank from the outside doesn't do much good. Here's a great video with several products tested:

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If you don't have a tank rinser, a wand (rigid or flexible) is probably your best bet for keeping the black tank sensors clean.

Quote:
Originally Posted by Shawn.O View Post
I was just reading up on the GEO method, one question, do you still use the typical RV toilet chemicals along with this method or is this a full replacement for those chemicals? I would still think you would want to help breakdown the solids in the tank, not sure if the GEO method would do that?
We never use chemicals in any of the tanks. Not go to into too much detail, but I drain at home and use a clear elbow...



... And there's not much left that's still solid after it's sloshed around in the tanks for a bit.

Quote:
Originally Posted by Timex View Post
I use the Black Tank Flush on the side of the TT every time I can. About every 2-3 trips, I'll run the wand down the toilet into the tank to give it a real good washing. After flushing at the campground, I'll leave about 3 gallons of water in the tank with the tank chemical and a capful of Calgon. The solution will slosh around and leave a slick residue on the sides of the tank making it easy for "things" to leave the tank when dumping it.
^^^ What Timex said... though with our new-to-us trailer I haven't had to wand the tank yet as the factory rinser does an excellent job.
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