Been parked for 9 days at a CG with no sewer on site. We've been careful to go to the toilets on the CG most if the times except nights and early morning. Of course, the sensor showed 3/4 full after two days so we knew not to trust it too much from there but I think the waste have caught up to the sensor by now. Question is: once the sensor shows full, how much room is there still? ( kinda like how far can we drive on Empty).We still have 5 days before going home and would rather not have to go dump until ready to go.Also, what happens if we keep using when the sensors mark full if we can't see anything in the tank through the toilet hole?I should add that the black tank is 37 gallons and there are two of us in the trailer.

You will know when it is full! It may burp some air when flushing. Or, you will see the...ummm...stuff through the black hole. Forget about the sensors.

you can open the lid on the john and using a flashlight see where the level is. if you can see water then it's time to dump. but we've taken all of the stress out of this. experience has taught us that we (there's just two of us) can use the facilities in the MH for a week without *having* to dump. so I just dump the tank once a week or when we leave the park/CG, whichever comes first.

Sound is a good way for me to tell. It sounds different when you flush and it is near full

You should start seeing "stuff" through the hole in the toilet when the tank is full.One thing I was told when going through my initial inspection was to avoid using too LITTLE water when flushing. You don't want the black tank packed tight with solid material but rather more liquid then solid. A higher concentratiion of liquid versus solid will help move the solid stuff out of the tank when dumping. This is probably more important if you don't have a black tank spray installed to rinse the tank after dumping.I was also advised that after dumping to put a couple of gallons of water into the tank with a packet of black tank treatment to prevent any remaining stuff from solidifying.

We've used it mostly for urine and threw toilet paper in trash to save space. We do have a black flush and will use it.I guess my concern was for spillage on our way to the dump site if too full.

How full is full? (Black tank) | Good Sam Community

27 Replies

Cloud_Dancer
Explorer II
Sep 04, 2013
When in doubt,...dump.

There's just two of us, and our MH has 50 gallon black tank. The longest we go is 6 days, then we make sure we go dump.
BTW all of our guages/indicators work (fairly accurate too).
midnightsadie
Explorer II
Sep 04, 2013
is there septic tank pump out available at the park.
boubou64
Explorer
Sep 04, 2013
We've used it mostly for urine and threw toilet paper in trash to save space.
We do have a black flush and will use it.
I guess my concern was for spillage on our way to the dump site if too full.
2edgesword
Explorer
Sep 04, 2013
You should start seeing "stuff" through the hole in the toilet when the tank is full.

One thing I was told when going through my initial inspection was to avoid using too LITTLE water when flushing. You don't want the black tank packed tight with solid material but rather more liquid then solid. A higher concentratiion of liquid versus solid will help move the solid stuff out of the tank when dumping. This is probably more important if you don't have a black tank spray installed to rinse the tank after dumping.

I was also advised that after dumping to put a couple of gallons of water into the tank with a packet of black tank treatment to prevent any remaining stuff from solidifying.
Vet_Man
Explorer
Sep 04, 2013
Sound is a good way for me to tell. It sounds different when you flush and it is near full
rk911
Explorer
Sep 04, 2013
you can open the lid on the john and using a flashlight see where the level is. if you can see water then it's time to dump. but we've taken all of the stress out of this. experience has taught us that we (there's just two of us) can use the facilities in the MH for a week without *having* to dump. so I just dump the tank once a week or when we leave the park/CG, whichever comes first.
byways
Explorer
Sep 04, 2013
You will know when it is full! It may burp some air when flushing. Or, you will see the...ummm...stuff through the black hole. Forget about the sensors.

Forum Discussion

How full is full? (Black tank)

27 Replies

About Technical Issues

Related Content

Full black water tank

Black Tank Help Needed

black tank chemicals

Black Tank Full... wait.. What??

Clogged Black Tank