I live in a home built in the late 60s. The old set up for the washer was draining into a utility sink (1 1/2 trap that connects to a 2in main) I wanted to move the washing machine to the other side of the wall and remove the utility sink by including standpipe. So far, I connect a 2 in stand pipe, with a 2in trap. When the washer drains, is backing up into the utility sink. Is there any way to fix this mess I created (I don’t mind starting over) or should I just move the sink and have the washer drain into the sink (like before)?
Thanks for the help!