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Old 09-29-2011, 08:35 PM   #1
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Blackwater sensor problems

Here is my strange tale.

After dumping my blackwater tank, I started to fill the tank with water through the supply connection (with the blackwater tank valve closed).
I forgot (that day), that I was filling the tank and suddenly my wife and I heard and felt a "Thunk" sound. I ran to the tank and cut off the water then went to the toilet and found it half full of sewage. I checked everything and all seemed well, no leaks and everything working (and is still working), as it should, (lucky I guess).

Then someting strange started happening....I noticed that when I emptied the BT (blackwater tank) and then flushed the tank, the sensor lights would go down to empty as expected, BUT.... within 24 hours the sensors would read FULL again. I would go out and open the BT valve but I am sure that I would not get a full tanks worth of fluid from the tank. Everytime I empty the tank and flushed, the sensors react as they should (red to yellow to green to green) but again, within 24 hours it would be green to green to yellow to red.

Has anybody ever heard of this! Could something be filling the BT tank with water? Can the sensors really respond like this. The Sensors are reading correctly on the way down, just not (I hope), on the way up.

Let me know if anyone has ever had this problem

Thanks
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Old 09-30-2011, 12:21 AM   #2
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Try and properly flush your black water tank a few times. Then add 5 gallons of water along with a cup of Dawn and about 12OZ of calgon. Leave this in the tank during your next trip when you start. This will allow the solution to wash the tank and break up the Crap that is in there. Once you reach your destination use your tank as normal. When you finally dump the tank flush it out properly and make sure you add 5 gallons of water back in the tank. it is very important to always leave water in the tank, you can add some more calgon and Dawn also. This will help with keeping the indicator probes clean.
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