Pumped out water has to go somewhere . With the airgap, it will either back out your garbage disposal or pour out your airgap into the sink basin, depending on the location of the blockage.
The airgap causes the pump to be physically incapable of backfeeding the drinking water supply with dishwasher waste
The airgap causes the pump to be physically incapable of backfeeding the drinking water supply with dishwasher waste