I just purchased a razor 2650 tt And found out the plumbing from the shower is going to the black water/holding tank.Is this normal or did I someone make a mistake at the factory.I thought gray water was shower sinks etc and back water/holding tank was toilet only.The problem is the holding tank fills to quickly plus I am treating all that extra water.has anyone else found a fix to this I am considering re routing the plumbing to the gray water tank?????