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Old 10-17-2017, 05:54 PM   #1
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Black & Gray Water Level Gauges Wrong

Our 2007 Lexington 210:

After draining both black and gray tanks the gauges still read as much as 1/2 to 3/4 full. The gauges do read full before dumping but never go below 1/2 to 3/4 full after draining.
What is the best cleaning process to get them to read correctly after draining?
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Old 10-17-2017, 07:00 PM   #2
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Flush them if you have that connection. If I just dump them, my gages still say may 1/2 full. But a flush spray for about 15 minutes and all show empty.
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Old 10-17-2017, 07:03 PM   #3
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Flush them if you have that connection. If I just dump them, my gages still say may 1/2 full. But a flush spray for about 15 minutes and all show empty.


Thanks, but how do I do a ďFlush SprayĒ? Sorry but Iím new to this kind of maintenance.
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Old 10-17-2017, 07:20 PM   #4
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Your trailer may or may not have it. It's a connection near the city water inlet. You keep the blank drain open, connect a separate hose, and there are sprayers inside the black tank.
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Old 10-18-2017, 12:13 PM   #5
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Something like this black tank cleaning wand might help.

It functions somewhat like the black tank flush mechanism described by others. This goes down the toilet (when the water supply to the RV is off), and it jets water onto the sides of the tank.
In many cases, it may be desirable to use the wand for a few minutes, give the water time to soften dried tissue and other solids, which may be obscuring your sensors, then spray again.

Assuming your sensors are just covered in crud, this should make them function normally, and it will also reduce crud buildup in the entire tank.
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Old 10-18-2017, 12:21 PM   #6
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Good long flush always helps but...
I've had gauge issues with every RV I've owned. Some just don't seem to work right.
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Old 10-18-2017, 01:18 PM   #7
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I had the same problem with my 2016 FR Wildwood. Like u I googled and went on these sites. What finally worked for me was Calgon water softener ( u find it in the fabric softener isle) and Dawn dish detergent (This helps break down any grease that might be built up) . I poured into both my gray and black tanks and let it sit then when we took the trailer camping It got sloshed around in the tanks so by the time we got to the campground after hooking up the sewer hose I emptied it. Oh wow the stuff that came out. I have a clear elbow on the end of my sewer hose that way you can see when it's clean. What happens is that tissue or other stuff might get on the sensors in your tanks. If u let it sit it will get hard and makes u have false readings. I try not to put tissue in my toilet. I use a small trash can and just take it daily while you camping. Sometimes u do have an emergency but just make sure u get the toilet paper recommended for RV"s. I also use a 2 ply regular one also. u just want to make sure it's one that will dissolve quickly. U also know to get the toilet treatment stuff that u pour in your tank after each dump. They also make a treatment to go in your grey tank also. I use it plus I use Dawn dish detergent anyways just because it does work well on grease. Hope this helps.
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Old 10-18-2017, 02:17 PM   #8
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I had the same problem with my 5th. I tried everything, then my plumber recommended a digester product used for septic systems. They come ďaliveĒ in water and gobble up everything. My rig is in winter storage so I canít give you the product name. I worked like magic. I mix a scoop full in a bucket of water and pour it in the toilet and flush. Also I donít dump until over 2/3 full, even if it means letting it sit for long periods of time. Oh, and never any smell.
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Old 10-18-2017, 02:25 PM   #9
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I had the same problem with my 5th. I tried everything, then my plumber recommended a digester product used for septic systems. They come ďaliveĒ in water and gobble up everything. My rig is in winter storage so I canít give you the product name. I worked like magic. I mix a scoop full in a bucket of water and pour it in the toilet and flush. Also I donít dump until over 2/3 full, even if it means letting it sit for long periods of time. Oh, and never any smell.
Good luck.
This stuff?
RID-Xģ RV Toilet Treatment (Liquid)
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Old 10-18-2017, 02:30 PM   #10
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No, it is clearly for septic systems and available from plumbers or suppliers. Itís not cheap. But Iíve had mine for probably 8 yrs and still 1/2 full.
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