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Old 08-07-2015, 10:02 AM   #11
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As others have noted, the tank sensors are anything but accurate. I would recommend that you use the black tank flush connection instead of just draining the black tank. The use of a clear sewer hose adapter will allow you to see a reasonable amount of toilet paper being flushed-out that remained affixed to the black tank walls (and you keep flushing until no further debris and draining water is clear). Finally, one last recommendation if you use the black tank flush connection: use a water pressure regulator to ensure that you don't damage/create water leaks for the plumbing connected to the black tank.
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Old 08-07-2015, 11:58 AM   #12
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Out of the three sets of sensors (fresh, gray, black), surprisingly the black sensors are the only ones that actually work. The fresh and gray both read empty at all times.
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Old 08-07-2015, 12:05 PM   #13
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Out of the three sets of sensors (fresh, gray, black), surprisingly the black sensors are the only ones that actually work. The fresh and gray both read empty at all times.
Then you'd better get the system checked. Sounds like a broken wire to the fresh and grey tanks...
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Old 08-07-2015, 01:28 PM   #14
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Then you'd better get the system checked. Sounds like a broken wire to the fresh and grey tanks...
X2

All my tanks now typically read about 2/3 full, even the FW tank. WE never put any TP in our black tank and it two reads 2/3 full.
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Old 08-07-2015, 01:38 PM   #15
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Try the GEO method for holding tank useage. Give this a good read:

https://sites.google.com/site/cbruni/
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Old 08-07-2015, 02:03 PM   #16
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Try the GEO method for holding tank useage. Give this a good read:

https://sites.google.com/site/cbruni/
Generally speaking I do most of this except for the bleach. Bleach kills any and all the good bacteria that helps keep the odors down. So no bleach. If I had to do a sterilization for maintenance, that would be different.
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Old 08-07-2015, 03:34 PM   #17
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Bleach kills any and all the good bacteria that helps keep the odors down.
Ummm .... what bacteria (names? genus? species?) help keep the odors down? Just curious.
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Old 08-07-2015, 05:22 PM   #18
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X2

All my tanks now typically read about 2/3 full, even the FW tank. WE never put any TP in our black tank and it two reads 2/3 full.
So I guess we can all imagine what is glommed onto your sensors.
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Old 08-07-2015, 10:13 PM   #19
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I bought a used one and it showed empty when I bought it. That was the last time it showed empty. Mine always shows it's full. After doing some research on this forum that seems to be pretty common. My gauge is a flashlight and look down the toilet. Its worked for two seasons now.
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Old 08-07-2015, 10:29 PM   #20
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Ummm .... what bacteria (names? genus? species?) help keep the odors down? Just curious.
I don't know the names but your tank has "Good" bacteria in it. It comes from whatever product you use to treat the tank. Think RidX for your home septic system. I work on a boat with a self contained sewer system and I add bacteria to it once a week. This bacteria treats the solids and liquifies it as well as treats it so it can be pumped overboard to the EPA specified parts per million of effluent. If bleach gets near the toilet I will tear a New one in whoever does it as it kills the bacteria and stops the reaction. Guess whose job it is to open the system clean and restart. But the offender will be beside elbow deep as well. Also the sensors on that tank work differently that the Rvs. It's a float sensor and not electrical probes. The probes are unreliable in this application as they get covered and continuously read full. A float sensor floats on the liquid and is more reliable.
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