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Old 12-18-2013, 02:02 PM   #11
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Here is a concoction: 2 cups liquid water softner (calgon) 1 cup liquid laundry detergent, 1 cup warm water. Mix together add to black tank (which of course is empty). Let stand for 24 hours. Fill black tank to full and dump. I'd probably go for a short slosh drive first, then dump.
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Old 12-18-2013, 03:12 PM   #12
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My sensors have always worked but I use 1 cup calgon with 1 cup liquid laundry soap and use as normal. dump and flush, flush,and flush, every time use the above in the tank and pretty soon presto they will work. Google the GEO Method and this explains everything. I only use the calgon and laundry soap about 1 per month. Also about once a month (summer months) I do put a heafty amount of dish soap down the toilet then flush and when you pull the valve you'll see the suds coming out, then fill and flush again. We are full timing and my sensors have always worked. This is the stuff I do and it has worked.
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Old 12-18-2013, 04:05 PM   #13
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I also believe in the ice deal. Put about 10 pounds of ice down commode in a 1/3 to 1/2 full tank. Drive a little and flush. It helped mine.
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Old 12-18-2013, 06:43 PM   #14
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I dump my black tank every five days and flush it out everytime and never had any problem with the sensors !
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Old 12-18-2013, 06:49 PM   #15
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Like I posted previously, when we picked up our 08 Flagstaff when it was new and the 12 Flagstaff we have now, neither trailer had ever had anything but clean water in the tanks and were empty, the sensors all read 1/3. Even the fresh water tank was dry and read 1/3. I just don't pay any attention to them.
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Old 12-18-2013, 06:51 PM   #16
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A diet high in fiber also helps... ; )
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Old 12-19-2013, 01:30 AM   #17
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When the tank doesn't read empty when I dump, I run the in tank flush for 4 hours and it returns to empty. You just need to wash the slime on the tank walls off between the sensors which are just screw heads connected to the 12 volts of the coach that uses the water as a path to ground to light the lights. The slime on the walls shorts them out so they don't shut off.
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Old 12-19-2013, 06:13 AM   #18
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when using a full hook up rv site is it best to have the tanks open or closed until they need dumping ? have heard both but would like to hear from some full timers.
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Old 12-19-2013, 06:55 AM   #19
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Quote:
Originally Posted by GaryanJane View Post
when using a full hook up rv site is it best to have the tanks open or closed until they need dumping ? have heard both but would like to hear from some full timers.
Leave the black and gray valves closed, wait till they are about two thirds full then dump the black and then the gray.

After flushing the black put a few gallons of water and a pack of treatment orange or blue or what ever it is that you use.
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Old 12-19-2013, 07:03 AM   #20
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Leave the black and gray valves closed, wait till they are about two thirds full then dump the black and then the gray.

After flushing the black put a few gallons of water and a pack of treatment orange or blue or what ever it is that you use.
Thanks for the reply
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