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Old 05-22-2014, 09:05 PM   #11
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Look up the GEO method. You use water softener and detergent instead of store bought stuff. It really cleans and keeps stuff from sticking.
X2. I haven't had a problem since I went to this method. The only time my black tank is dry is after I winterize my unit.
After I dump I add 1/2 cup Calgon, 1/2 cup dollar store plane liquid laundry detergent in 5 gallons of water to the black tank. Here K-Mart carries Calgon. 1 box last a season for us.

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Old 05-24-2014, 02:54 PM   #12
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I had the same problems with my sensor. It read 2/3 full when empty. Put about 3 gallons of water 2 small bags of ice, drove a while, still didn't work. 2nd attempt, 3 gallons water a cap or two of cascade. Checked it before dumping, still didn't work. After dumping filled the tank (visual check) and dumped tank. Then it worked. Figure there was something stubborn on the sensor. Think the ice, and cascade loosened or softened whatever was causing the problem but the second full tank clear water flush did the trick....Hope it works for you.
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Old 05-27-2014, 07:34 PM   #13
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Thanks for all of the imput. I loaded it up with sone water and detergent and the gauge was working properly when I got to the campsite. After the long weekend and dumping the tank it now still shows 2/3 full. Has anyone installed a tank cleaner like a tornato?? If so how easy was it???
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Old 05-27-2014, 07:40 PM   #14
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FYI - Gray tank problems can usually be traced to hair and soap.

Black tank problems are almost never TP (the probes are almost flush with the wall). Slime will form on the walls shorting the probes to ground.
I fixed mine like this:

Horst tank Probe Installation

RV Holding Tank Sensors - Get accurate grey and black holding tank monitor readings

More than you will ever want to know about holding tanks:
https://www.google.com/search?q=gray...iverforums.com
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Old 05-27-2014, 07:48 PM   #15
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I have put ice in black tank many times and drove home....no problems and works well. I also use the geo method
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Old 05-27-2014, 07:58 PM   #16
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Five or eight pound bag, pour the ice toss the bag make it the very last thing you do.
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Old 05-27-2014, 08:29 PM   #17
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I stop at one of those stand alone ice machines you see today and get the coolerfull load of ice. Pour that in with roughly 1/3-1/2 tank of water and tow it. The ice gently scrubs the walls but doesn't hit anything hard enough to damage it.

If you're going camping again soon you can toss a sanitizer pack in to keep that from smelling, if not then find somewhere to dump it and do your regular sanitizing.
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Old 05-27-2014, 08:47 PM   #18
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Quote:
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FYI - Gray tank problems can usually be traced to hair and soap.

Black tank problems are almost never TP (the probes are almost flush with the wall). Slime will form on the walls shorting the probes to ground.
This is a very important point. The slime hangs to the walls and is conductive. The sensors think it is the water level and turn on. Clean walls don't give false readings.
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Old 05-28-2014, 03:02 PM   #19
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Thanks for all of the input from everyone. I'm still having some issues with the sensors but it looks like I need to pull them out and check to see the condition of them.
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