Originally Posted by tgduffy
Taking a look into the toilet would seem like a way to determine "it's full!". Can't see much further down into the black tank from the toilet. .
you can see the level if you really want to,.... yes, you're looking into a dark hole, thru flowing water, so it requires a little effort,.... helps if the room is dark and using a flashlight, just like you would looking into any other dark hole,..... but doing that is much more reliable than the tank monitors,.... after awhile you will learn about how many days it takes for you/your family usage to near the full level,..... that's how we monitor our black tank,...... there are hundreds of post complaining about the tank monitors,....... we don't rely on them so we don't have any complaints about them, but that's just us,....