When to dump?

Originally posted by howmanyds The warning label next to the black water tank flush inlet says to only use it when the "fullway termination valve is in the open position." I think that means to only use it when the black water valve is open and draining through the sewer line, correct? I imagine this is because of air/water exchange. So, when I want to fill the tank in order to drain it, and then fill it again to rinse, could I use this valve as long as I've propped open the toilet flusher instead of the drain valve? Or do I have to bring the hose in through the bathroom as others have mentioned?

There isn't any kind of air lock issue, the black tank is vented through the roof.

The reason they don't want you to use the BWF with the valve closed is.. if you get distracted.. It will fill the tank.. then start filling the vent tube.. then start flowing all over the roof and outside of the pod. REALLY. It has happened. To pods I know. The exact same thing can happen with a hose in the toilet.. except the roof vent on the outside of the camper won't be the overflow point. The toilet will be. And that will be flowing all over the inside of the pod. OK, technically it will have to fill the grey tank first.. but, well, you forgot it already.. so..

All that said. I fill and flush a couple times, a couple times a year. I have FHU at home, so it's easy and convenient. I use the timer function on my phone (because I get distracted easy). It takes our hose about 5 minutes to fully fill the black tank.. At four and a half minutes or so, I open the dump.

Yup makes like a pod volcano!

The Pea Pee Pod? Poo Pod? YUK.

The wall panel sensor is not useless, just not precise. If you look at where the sensors are located on the tank, there is not much vertical space between the low and high sensors. The same thing goes for the fresh and gray water tanks.  Full is only relatively full. There is additional space. However, if it is reading full, that would be a good time to dump before it reaches so high the toilet can't flush.

Keeping the black and gray water tanks cleaned out seems to be the best way to keep the sensors operating. If there is a build-up in one of the the tanks, it might cover the sensors to the extent that they can't detect the liquid levels. The fresh water tank is, of course, not (at least, it better not be) affected by this problem.

There is no alarm to alert when the tank is full and in danger of overflowing. One must monitor the tanks. Adding an alarm might be a good mod to make if someone knows how to do it. I don't, so I will just monitor the levels.

Yup, when you see the black water rising up towards the toilet you are at the end.  You might get one more flush.  The gray water tank is full when the shower pan starts to fill up.  Every camper I've owned, the sensors were useless on the black tank, and only somewhat useful for the gray and fresh tanks.