Black water tank still at 2/3

[Reboot123]

I have a 2015 33rlds. Mine was the same as yours. What I do now is I empty the black tank, then I fill it up, let it sit for a bit and drain it again. Then I put the conditioner in it. It is working a lot better now. I am not getting the false readings.

[BigJohnD]

For cleaning the tank and sensors, try a product called RV Digestit. You can use it to clean sensors and tank, or just as a tank chemical. I assure you it'll work if you follow the instructions. To clean tank / sensors, 1 bottle to full tank of water, let sit for 48 hours plus, dump and flush. You'll get crap out of a tank you didn't know was ever there. We have used the Geo method, and it works, but also have our home brews. I can't leave well enough alone. It's a crap tank, experiment a little. I'm always trying different things. Water softener plus (pick an additive - purple power, pine sol, dawn etc). Have yet to have an issue with sensors or having a dirty tank. I know the Digestit stuff works as I've seen the results from other's rigs.

[BigJohnD]

Another thing that they all tell you never to do, but should be a must. Opening the tank and running the flusher after tank is empty does little to nothing for getting extra stuff out. Filling the tank with the flusher and dumping, repeating several times does (They tell you never do this). Trick is to stay dedicated to that job, guess that's why they tell you don't do it. When all of our campers were new, we hook the flusher to the same water source for consistent gpm, time on a stop watch filling the tank to capacity (Gotta look down the toilet). This way we know when the oh crap moment is. The flush nozzle is usually mounted at 50% or a little above, depending on manufacturer. If you can hear the change in the sprayer (it'll get quiet), you know you're about to go too far.

There's a guy on youtube that made a clear tank and tested all the flushers, ice cubes etc. Gives you a better idea of what really works. On some rigs, we've created our own sprayer set ups utilizing as many as 3 jets in a tank, equal piping lengths to each with a common supply. Not all factory sprayers are set up very well.

[mohok1]

Lie-o-meters at best.

[OhioRVMom]

i was told by a camper at the camp ground to put ice in the toilet and drive it around. as it sloshes, the ice rubs against the sensors and clears them (supposedly it helps) then it just melts away.. never had the chance to try it and just got our rig last night so if I have a problem ever I'll give it a shot.

[BigJohnD]

Look up "The Fit RV" on YouTube. Here's a link to the test the guy did with the ice cubes.

https://www.youtube.com/watch?v=iH6acEmqvcw

Doesn't appear to work to well. He also tests several black tank flush systems. Interesting if nothing else.