Inky Black Bilge Water?

[Boracay]

Where does the overflow from your holding tank go?

[JusDreaming]

I get the same thing in the head if I leave salt water in the bowl for a long period. I think it is just stagnant salt water. I have found it in the sediment filters if left for a long period also.

[swami maximus]

I can even take a picture of it if anyone is still interested. It is as described, inky black stinky water. No, it's not oily. No, it's not holding tank. My bilge pump died, and the water went stagnant for a long while. Then I tried some bilge cleaner from WM, and dumped the whole bottle in... (Yeah. I know...) and the very next time I went to look at it, it was like an ink well. My guess is some chemically reaction with stagnant water and some sort of growth of some type.