How does a dishwasher drain?
After each wash and rinse cycle, water is filtered and drained out of most standard dishwashers through a hose and into a garbage disposal and/or your home’s waste system. The filter, usually located underneath the lower rack, helps protect the circulation pump from the accumulation of food particles.
If your dishwasher isn’t draining properly, it may be clogged or you may need to clean your filter. Keep in mind that portable dishwashers use two hoses that are attached to the faucet with a hose connector. One is used for taking water in, and the other is used to drain.