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Old 04-27-2015, 07:24 PM   #1
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Black water sensor issue.

We have purchased a used Puma and although it's empty the panel says 3/4 full. I understand that this is a common problem but I'd kinda like to get it working. My fear is that a piece of "something" has stuck and dried to the sensor. Here's what I'm thinking. 1 cup water softener, 1 cup detergent, a whole lot of ice and go drive around like a nut for a while. Your thoughts please.

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Old 04-27-2015, 07:27 PM   #2
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That might work. But sometimes stuff just gets stuck. Others will chime in with all kinds of tricks.



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Old 04-27-2015, 07:49 PM   #3
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This is a the problem with units that are seasonal, they dont' move and if any TP or other substance lands on the probe its pretty much there for the duration.

Its probably to late for the softner and detergent to do anything right now, as for the ice good in thought but it will probably melt before you get your rig off the driveway.

My thought would be to fill your tank about a 1/4 or 1/3 and get into some stop and go traffic. Get the water to slosh around violently. Sometimes you get it first attempt sometimes not.

Those probes are notorius for being inaccurate, they are more so a guide line.
Maybe when you tank is actually full the indicator will register as full. Thats all you pretty much need anyway. Once the indicator says full you have some flushes left but you will need to dump soon.

My understanding for the water softner is this will soften the water and materials are less likey to stick to the tank walls and probe. As for the detergent, well that just cleans and helps dimish the odour.

Well thats my couple of pennies, I'm sure others will pipe in and may be able to help you better.

Enjoy the time out and don't fret of this........

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Old 04-27-2015, 08:04 PM   #4
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Oh, I'm not gonna lose any sleep over it. Actually, one idea is to pour 5 gallons of boiling water down the toilet, with the tank empty of course. Theory is that the steam may soften the stuck on stuff.
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Old 04-27-2015, 08:37 PM   #5
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Fill the tank and use RV Digest-It. Maybe double strength.Many good reports.
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Old 04-28-2015, 12:03 PM   #6
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I agree that it may resolve itself if you travel a bit with some "stuff" in it. We do put some Calgon in our tank when we put in the little blue packet. When we picked up the TT the RV guy told us it helps to keep "stuff" from sticking as badly. Kind of like throwing a pinch of salt over your shoulder to keep away bad luck when you spill the shaker. It most likely makes no difference, but it doesn't hurt or cost much to do it anyway. Good luck.
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Old 04-28-2015, 02:23 PM   #7
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I wouldn't advise boiling water in plastic plumbing. Especially RV plumbing.
I too have heard good reports about the RV Digest-IT. I have had this issue on two different campers. It was hit and miss. But it seems like whenever we moved or traveled with some liquid in the tank that helped more than anything. Good luck.
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Old 04-28-2015, 02:34 PM   #8
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black water tank

Sure fire fix...When you are leaving for a outing to a park that has a dump station put 1/3 full water (estimate) put two or three bags of ice down toilet and drive the ice will act as a cleaner in the water and clean off any stuck debris when you arrive at location dump tank before parking.
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Old 04-28-2015, 02:43 PM   #9
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I have been full-timing for twenty years and haven't found a trick that works for more than two fills. You can drive yourself crazy trying to get the d--- sensors clean only to have them mess up again in a week. A 35-40 gal black water tank will take care of two people for at least a week and a half.
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Old 04-28-2015, 02:50 PM   #10
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It could be a pain but ice works and less harmful to the tank and cheap. Also I found that using 2 ply paper does not cause issues that much either.

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water, black, black water

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