When the washer drains in the basement,the double sinks fill up with water and then immediately drain when the washer finishes the cycle. The water drains into the major drain . In the major drain there is a vertical pipe which empties into the major drain.

Are we talking about a dishwasher or a clothes washer? More details please. Back to you, Tom

Hi wild,

Your post is confusing. So in trying to answer this I will just be general. Sometimes you have sudsing action. This is when the soapy water which has more air in it bulds up on a change of direction fitting (trap). This slows down the draining of the waste water. Also the drain line from the laundry tray may be too small. I generally use 2" pipe to drain a washing machine, especially autoamtics because of the pump in them. I am assuming also you have the drain within code limits to the stack? Took long a line not properly graded can degrade the drains capacity to empty as quickly.if not, you should be within proper distance from a vent. If not you can add an air admittance valve after the trap.this will vent your drains if you are not within the proper code requirements.