I have a dishwasher and washing machine in a utility room off the kitchen. There are 2 separate waste pipe connections on the main pipe and I'm wondering if this is correct? Photo here It looks to me (as a very unqualified person!) as though if the dishwasher waste pipe flows downward the water will flow into the waste of the washing machine and into the machine itself. It's a small space so I understand why it has been connected this way to allow room for a small shelf if we want one. Any help is appreciated. Please ignore the electrics as an electrician is going to fix this.