Step 5 · Connect Drain Hose with High Loop
Route the new drain hose from the dishwasher to the connection point under the sink. To prevent dirty water from the sink backing up into the dishwasher, you must create a 'high loop'. Pull the drain hose up as high as it will go under the countertop and secure it to the underside of the countertop or the top of the cabinet wall with a strap or zip tie. From this high point, loop the hose back down and connect it to the garbage disposal's inlet nipple. Slide the hose clamp over the end of the hose, push the hose firmly onto the nipple, and tighten the clamp securely with a screwdriver. Tug on the hose to ensure it's firmly attached.