 it kind of looks like it's almost floating on the surface of the water sometimes, you know, and you flush it and it goes away. But then if you don't use the toilet for a while, like down the basement, an actual, like, black streak comes down, you know, like maybe the toilet was running or whatever. Well, let's try them both and let's see where we get, and then we'll have to scratch our heads and dig a little deeper.