[Akgleick]

I'm really hoping someone can help me. I am getting black water coming back into the bowl slowly after flushing. The toilet that came with the boat was a jabsco and it the same thing was happening. Here is what I have done.

Replaced toilet with raritan marine elegance
Flushed out vent and vent line.
Talked with tiara customer support
I used 1 gallon of raritan CH to clean out the waste hose

I called raritan they said it seemed there was too much pressure in the hose and it was slowly getting by the joker valve.

The hose from the head to the tank goes thru the bulkhead at the top then drops down along the floor under the sink and then up to the back of the head. I don't think black water is coming from the tank but is the stuff sitting in the hose.

I am $700 into this so far and still have the same problem. Any help would be greatly appreciated.

Thanks