Seekeroflight
Garland
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Joined: 01/03/2010
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'95 Tiffin Allegro 28 or 29 footer (depending on who you ask)
Both the black water and gray water tanks seem to fill up pretty quickly. When I check the status (button on the vent hood) I find that sure enough they're full. So, first I let the last drop of both the Black Water and Gray Water tanks escape down the drain. Then I check the status of both tanks (vent hood button) and it shows both tanks still 1/2 full.
It is 17 years old and I don't know how poorly it was treated before we came into possession. Is there a simple way to check for and possibly remove any . . . shall we call it . . . debris?
May you live in interesting times,
Seeker Of Light
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Terryallan
Foothills NC
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Joined: 06/28/2004
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Often, The sensors in the tanks get covered over, and will not read correctly. There is a good chance the tanks are empty, but reading 1/2 full. Mine do that. Some one on here told how to clean the sensors, but i forgot, Just not that important to me. But I'm sure they will chime in again.
Terry & Shay
Coachman Apex 288BH.
04 F150, 5.4, Lariat SuperCab
Lazy Campers
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rexlion
Broken Arrow OK
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Joined: 04/01/2005
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I'll guess that the sensors are probably gunked up inside the tank. You might have some success in the black tank by spraying with a hose from up top, through the toilet drain opening. Spray all around well. Another help is a Flush King, which has a knife valve and a hose attachment. You hook the Flush King to your drain, empty tanks, close the valve and turn on the water. This fills the holding tank with fresh water. When close to full you open the valve and drain, then repeat.
I am sure some other folks will have more ideas.
Mike & Sherry
2000 Mercury Mountaineer
2008 Toyota Highlander
2011 KZ Spree Escape E14RB
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J-Rooster
Port Orchard, Wa. / Lake Havasu City, Az.
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Fill your tanks up with water, add 6 capfuls of RV Digest (can buy it online or google it) and let your tanks sit for 24 hours with the RV Digest working. RV Digest has enzymes that eat up all bacteria in your tanks. It will clean your sensors right up. I've used it and it works good.
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2oldman
Winchester WA
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Joined: 04/15/2001
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dirty sensor 1
dirty sensor 2
dirty sensor 3
Clean sensors 2010
False black water reading
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RFCN2
MT
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Joined: 05/29/2011
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I agree with the previous poster on enzyme. We use enzyme bacteria clears in both our black and grey tanks every time I empty them. Also, about a year and a half ago I put in the SeaLevel system for reading tanks. Not very expensive and it gives a very accurate tank readings. Very useful if you boon dock.
RFCN2
Country Coach
Jeep Wrangler Unlimited
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gbopp
The Keystone State
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Joined: 08/03/2008
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Many keep their tanks clean using The Geo Method.
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korbe
Northern California
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That inaccurate gauge reading is my prompt to clean and rinse the tanks a little better. Cause once those sensors are working properly, my tanks are as clean as a whistle.
2004 F250 SD PSD
2004 Crossroads Cruiser CF25RS
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Mississippi
Starkville, MS, USA
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Joined: 01/22/2001
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Easy fix - Fill tank with some water and then dump some ice cubes in the tank and head down the road. When you stop, dump the tanks and the probes should be clean. Worth a try due to low cost.
S. Keith Winfield,CPA
Carol Winfield, copilot
Jolie Karra Tassos, resident English Bulldog
2008 Dutchstar DSDP 4304
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Gdlow
Meridian Idaho
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Another thing that it "may" be is a faulty board in the control panel where you view the tanks status...If doing the cleaning doesn't take care of it..have the boards checked..
Gary And Cathy
'05 Dolphin 5342
Honda Element following us 
"The Dolphins"& Pacnats
GS, FMCA 365597
 Rallys attended
FMCA Albany, Or.'06
FMCA Redmond, Or.'07
FMCA Quartzite, Az. '10...but not again
Good Sams "The Rally" Redmond Or. '11
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