Originally Posted by gene2661
Thanks for getting back...But I thought that the shower was GW and not BW. If so then the GW shouldnt fill up in 2 days
Generally, the shower and sinks are gray water and the toilet are black. Maybe there is something about the unit you have that pipes the gray into the black.
As for the tank monitors, the lights for the BW are notoriously incorrect, as mentioned. Toilet paper and other "stuff" messes with the sensors. Best to look down your toilet or look at the tanks outside to see how full it is.