RCMAN46 wrote:
I agree I would never trust a tank level indicator.
The morning before I plan to drain the black tank I fill the toilet several times and watch as I flush the toilet. If the tank is near full you will notice the toilet draining different or slow.
Then with the black valve open and the flush valve open I watch the clear adapter for material coming from the black tank.
Also while dumping the black tank I have the wife fill the toilet to maximum and flush the toilet. This will help dislodge solids in the black tank. I have her continue the process until I do not see any thing except water in the clear adapter.
I have the flush routine down and the sensors work fine as long as nothing is stuck to them -- so when they indicate the water level is below them they are cleared of debris. The reason I want to add the additional set of gauges is to avoid having to involve my wife in the flushing process so she can be doing other things.
Our sensors are quite reliable for showing the presence of water, its getting them to indicate the absence of water that requires them to be cleaned off. But when I am finished flushing the tank, ours always read empty so keeping them clean is the key to reliability.
