Luckily the discharges are the same size so that shouldn't be an issue. I havn't had a chance to find out what drains into where though - know the kitchen sink goes into the "black" and toilet into the "grey".
The thing that irks me is the lack of quality control. I have tried to both email them and phone and sofar no reply. Unfortuanlty I don't even know what to say as so far ive been able to take care of the issues myself-but what will come up next.
We looked at alot of units before we bought -or should i say went into debt - for this one -makes me wonder