Black water guage

I use the GEO method. Black tank sensors work all the time. Gray sensors most of the time.

If you really want to monitor accurate tank levels, look into upgrading to an external sensor system such as the various SeeLevel II models. The sensors and monitor can be installed using your existing wiring, and the levels are displayed as percentages rather than the inaccurate steps the led lights show on other monitors.

luggnutts wrote:
I have a problem with my black water guage. So I'm here for the help i know I'll get . My guage reads 2/3rds full even though the tank is empty. This has been confirmed by others (rv owners) who say they have had the same problem. Done the suggested remedies IE; 5 lbs ice 10lbs ice 20lbs ice down toilet, then drive around to agitate the ice in the tank and clean the sensor.Having done the ice thing with no luck. I tried a tank scrubber that was loaned to me by a fellow rver. tried this method twice, with no luck. I can't be the only one with this problem !!. OH I've also been told to replace one or both units ( sending unit or or the panel unit). THANkS IN ADVANCE, FOR THE HELP I KNOW IS COMING.

First, forget the worthless gauge with it's always dirty sensors, with no matter what you might do, to permanently correct it.
Second, use a lot of water for flushing, dump every 3 - 4 days and save yourself not only the use of chemicals, but combating unwanted smells from time to time.
We only use chemicals for storing and have less problems than most.

The culprit in general is dirty tank walls where fluid holding crud builds up and fools the sensors into thinking there is fluid in the tank.
Whatever you can do to clean the walls may help.
I have tried everything recommended over the years - ice, TSP, various solutions, Happy Camper, etc - and nothing worked.
Some things that do work for weekend warriors don't work for full timers and that may be why some methods work for some people and not for others.
I know I have to dump the black tank every 10 days so I just mark the calendar and dump according to it.

Stop looking at those level indicators.....LOL

Serious. I haven't looked at mine in over 7 yrs.

They are just a 'stud' that sticks thru this side of tank at different levels.
Scum, crud, deposits, stuff and TP stick to them and thereby make up circuit giving false readings.

They are installed by an evil ex-rv'r to make rv'rs go crazy trying to keep them clean/functioning.

I have a clear adapter that goes on between drain line and drain hose. I can see how well the stuff flows out, when it stops flowing and how clean it is when flushing/rinsing waste tanks.

Besides.....
When toilet 'burps'....time to dump black tank
When sink/shower start draining slower..time to dump grey/galley tanks
When water pump goes....Burrrrrrrup. Should have added water to fresh water tank

That is about 7-10 days for us.