We recently had new corian countertops (including corian sink) put in. My husband
Connected the plumbing. Now, when I wash dishes in one side the suds back up into
The other side. What is wrong? It drives me crazy.

There is probably nothing done wrong. Suds do not drain as freely as water, they stick to the walls of the piping. Try putting the drain stopper in place in the other drain while washing dishes.

Several things come to mind. 1)You could have a partial clog in the lateral drain in the wakk in which case it will have to be snaked from the trap, 2) Your hubby drained the tubs using a continuous waste and a single trap, if he had ran a wye off the stub-out and picked up each tub with its own trap the suds would not be as likely to come up in the other tub. Regaeds, Tom