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  • Writer's picturechad walker

Here's Why Your Dishwasher Stinks

Short version: Your dishwasher drain hose doesn't have a high loop.

What's a high loop? Here's a 71 second video explaining it all and how to fix it.

Dishwashers have become an integral part of modern kitchens, offering convenience and efficiency in maintaining cleanliness and hygiene. However, to ensure optimal performance and prevent issues like water backflow or contamination, it's crucial to understand the role of certain components, particularly the dishwasher drain hose high loop. This blog post delves into the importance of the high loop, how it works, and provides a detailed guide on installation and maintenance.

Here's a deep dive into everything "high loop", why it's so important and how to fix your own stinky dishwasher issues.

Preventing Backflow:

One of the primary functions of the high loop is to prevent backflow. Backflow occurs when dirty water from the sink or garbage disposal flows back into the dishwasher, potentially contaminating clean dishes. The high loop acts as a barrier, ensuring that waste water does not re-enter the dishwasher.

Maintaining Hygiene:

By preventing backflow, the high loop maintains the hygiene and cleanliness of your dishwasher. This is crucial because backflow can introduce harmful bacteria and contaminants into the dishwasher, compromising the cleanliness of your dishes and posing a health risk.

Enhancing Efficiency:

A properly installed high loop enhances the efficiency of your dishwasher. By ensuring that the drain hose is positioned correctly, the high loop helps in the smooth drainage of water, which is essential for the dishwasher to function optimally.

How the Dishwasher Drain Hose High Loop Works

The high loop is a simple yet effective mechanism. It involves creating a vertical loop in the drain hose, typically mounted to the underside of the countertop, above the dishwasher. Here’s a step-by-step breakdown of its operation:

1. Installation of the High Loop:

The high loop is installed by securing the drain hose at a point higher than the flood level of the dishwasher, usually beneath the countertop. This positioning is crucial as it utilizes gravity to prevent backflow.

2. Preventing Syphon Effect:

The high loop helps in preventing the siphon effect, where water could be sucked back into the dishwasher. By elevating the drain hose, the high loop disrupts this potential siphoning action, ensuring that waste water flows out and not back in.

3. Water Flow Direction:

During the dishwasher's drainage cycle, water is pumped through the drain hose. The high loop ensures that once the water is expelled, it does not flow back into the dishwasher. Gravity aids in keeping the water moving in the correct direction—away from the dishwasher.

Step-by-Step Guide to Installing a Dishwasher Drain Hose High Loop

Installing a high loop for your dishwasher drain hose is a straightforward process that can be done with basic tools. Here’s a comprehensive guide:

Materials Needed:

- Screwdriver

- Zip ties or clamps

- Mounting bracket (if required)

- Tape measure


1. Turn Off Power and Water Supply:

Before starting, ensure that the dishwasher is turned off and disconnected from the power supply. Also, turn off the water supply to avoid any accidental leaks.

2. Access the Drain Hose:

Pull the dishwasher out slightly from its cabinet space to access the drain hose. Typically, the hose is connected to either the garbage disposal or the sink drain.

3. Determine the Loop Height:

Measure the height where you plan to create the high loop. The loop should be as high as possible under the countertop, usually around 32 inches or higher.

4. Create the Loop:

Using zip ties or clamps, secure the drain hose in a loop formation. Attach the hose to the underside of the countertop or the side of the cabinet. Ensure the loop is tight and well-secured to prevent it from slipping.

5. Check Connections:

Ensure that the connections at both ends of the hose (dishwasher and drain) are secure. Tighten any loose fittings to prevent leaks.

6. Test the Installation:

Once the high loop is in place, push the dishwasher back into its position. Reconnect the power and water supply, and run a test cycle to ensure that the dishwasher drains correctly and there are no leaks.

Common Issues and Troubleshooting

Even with a high loop installed, you might encounter some common issues. Here are a few troubleshooting tips:

1. Persistent Backflow:

If backflow continues to be an issue, check if the high loop is positioned correctly. The loop might need to be higher, or the hose might have slipped from its secured position.

2. Slow Drainage:

Slow drainage can be caused by blockages in the drain hose. Disconnect the hose and inspect it for any clogs or debris. Clean the hose thoroughly before reconnecting it.

3. Leaks:

If you notice leaks, inspect the hose for any cracks or damage. Replace the hose if necessary and ensure all connections are tight.

4. Dishwasher Not Draining:

If the dishwasher is not draining at all, it could be due to a malfunctioning drain pump or a clogged filter. Refer to your dishwasher’s manual for specific troubleshooting steps or consider consulting a professional.

Maintenance Tips for the Dishwasher Drain Hose High Loop

Regular maintenance of the high loop and the drain hose ensures the longevity and efficiency of your dishwasher. Here are some maintenance tips:

1. Regular Inspections:

Periodically inspect the high loop and the drain hose for any signs of wear and tear. Look for cracks, leaks, or any loose connections.

2. Clean the Hose:

At least once a year, disconnect the drain hose and clean it to remove any buildup of debris or grease. This prevents blockages and ensures smooth drainage.

3. Check for Proper Installation:

Ensure that the high loop remains securely fastened. Over time, vibrations from the dishwasher can cause the hose to slip from its position.

4. Professional Servicing:

Consider having your dishwasher professionally serviced annually. A technician can thoroughly inspect all components, including the drain hose and high loop, and address any potential issues.

The dishwasher drain hose high loop is a vital component that ensures the efficient and hygienic operation of your dishwasher. By preventing backflow, it protects your dishwasher from contamination and enhances its overall performance. Understanding how to install and maintain the high loop is essential for any homeowner looking to keep their dishwasher in top working condition.

Regular inspections, proper installation, and timely maintenance can prevent common issues associated with the drain hose. By following the steps outlined in this guide, you can ensure that your dishwasher remains a reliable and convenient appliance in your kitchen for years to come.



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