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I have a double kitchen sink. When I empty the sink without the disposal it make a horrible sucking noise. The dishwasher also backups in the bottom of the dishwasher. How can I fix the noise and keep the water of getting back in the dishwasher?
It might not be vented correctly. Adding an automatic vent if legal may help. Sometimes removing the noise baffle in the disposal makes a difference also. The drain hose for the dishwasher should loop up to the top of the cabinet before entering the disposal or have an air gap.