What is a dishwasher high loop and why do you need one?

Have you noticed dirty water pooling at the bottom of your dishwasher after a cycle and wondered what’s causing it? Or perhaps you’ve been greeted by unpleasant odors when opening your dishwasher, even though you run it regularly. The solution to these problems might be simpler than you think—a dishwasher high loop. We’ll explain what a dishwasher high loop is and why it’s essential for maintaining a clean and efficient dishwasher.

What is a dishwasher high loop

A dishwasher high loop is an installation technique where the dishwasher’s drain hose is looped upward and secured at a higher point before connecting to the kitchen sink drain pipe or garbage disposal. This loop typically reaches as high as the underside of your countertop. By creating this upward loop, it prevents dirty water from flowing back into the dishwasher during drainage, ensuring that your dishes come out clean every time.

How does a high loop prevent backflow?

The high loop serves as a barrier against backflow, which is when wastewater flows in the reverse direction due to siphoning or pressure differences in the plumbing system. By elevating the drain hose above the sink drain connection, it becomes difficult for gravity or pressure changes to push dirty water back into the dishwasher. This measure keeps contaminants out and maintains the hygiene of your dishwasher.

Why you need a dishwasher high loop

Protecting your dishwasher from contamination

Without a high loop, there’s a risk that wastewater from your sink or garbage disposal could siphon back into your dishwasher. This backflow can introduce food particles, grease, and bacteria, contaminating your clean dishes and creating an unsanitary environment. By installing a high loop, you ensure that only fresh water circulates inside your dishwasher during wash cycles.

Preventing drainage problems and odors

A properly installed high loop helps your dishwasher drain efficiently. If wastewater can’t flow back into the appliance, it reduces the chances of standing water at the bottom of the dishwasher. This not only keeps your dishes cleaner but also prevents unpleasant odors caused by stagnant water and bacterial growth.

Compliance with plumbing codes

In many regions, local plumbing codes require the installation of an air gap for dishwashers, while in others, a high loop is acceptable. These regulations are in place to prevent cross-contamination between the dishwasher and the household water supply. Ensuring you have the proper backflow prevention device installed keeps you compliant with local codes and adds an extra layer of protection for your home’s water quality.

How to install a dishwasher high loop

Installing a high loop is a straightforward DIY project that you can complete with minimal tools and time. Whether you’re setting up a new dishwasher or retrofitting an existing one, here’s how you can do it.

Materials you’ll need

• Dishwasher drain hose (if not already installed)
• Cable clamps or zip ties
• Screwdriver or drill
• Protective gloves

Step-by-step guide

1. Turn off the power and water supply: Unplug your dishwasher and shut off the water supply to prevent any accidents.
2. Locate the dishwasher drain hose: Find the flexible drain hose connected to the back of your dishwasher. It typically runs alongside the water supply line under your sink.
3. Create the high loop: Pull the drain hose upward and loop it as high as possible under your sink. Aim to secure it just beneath the countertop.
4. Secure the hose: Use cable clamps or zip ties to attach the hose to the underside of the countertop or the wall. Ensure it’s tightly secured to prevent it from sagging over time.
5. Connect the hose to the drain: Attach the end of the drain hose to the sink drain or garbage disposal inlet. Ensure the connection is tight to prevent leaks. Refer to our guide on how to install a dishwasher for detailed instructions.
6. Test the setup: Restore the power and water supply, then run a quick wash cycle to check for proper drainage and leaks.

By following these steps, your dishwasher will have a proper high loop and run more efficiently.

Troubleshooting common high loop problems

Even with a high loop installed, you might encounter some drainage or performance problems. Here are some common problems and how to address them.

Dishwasher not draining properly

If your dishwasher is still not draining correctly, the drain hose might be clogged. Over time, debris and food particles can build up inside the hose. To fix this:

1. Disconnect the drain hose from both the dishwasher and the sink drain.
2. Inspect the hose for any visible blockages.
3. Use a long, flexible brush or run water through the hose to clear any obstructions.
4. Reconnect the hose and ensure the high loop is securely in place.

Persistent odors coming from the dishwasher

Unpleasant smells can result from trapped food particles or backflow. To eliminate odors:

• Clean the dishwasher’s filter regularly to remove trapped food debris.
• Run an empty wash cycle with a dishwasher-safe cleaner or a cup of white vinegar placed on the top rack.
• Verify that the high loop is correctly installed to prevent wastewater from re-entering the dishwasher.

For more detailed cleaning tips, check out our article on dishwasher safety, cleaning & maintenance.

High loop not high enough

The effectiveness of the high loop depends on its height. If it’s not looped high enough, it might not prevent backflow adequately. Ensure the loop reaches as close as possible to the underside of the countertop. Re-secure the hose if necessary, using additional clamps or supports.

Understanding air gaps as an alternative

In some areas, building codes may require the installation of an air gap instead of a high loop. An air gap is a fixture mounted on the countertop or sink that provides a physical separation between the dishwasher and the drain to prevent backflow. If local codes mandate an air gap, or if you’re still experiencing backflow problems, consider installing one. Always consult your local regulations and manufacturer guidelines.

Additional tips for dishwasher maintenance

Maintaining your dishwasher extends beyond installing a high loop. Here are some tips to keep your appliance running smoothly.

Regularly inspect and clean the filters

The dishwasher’s filters can become clogged with food particles, affecting cleaning performance and drainage. Remove and clean them monthly to ensure optimal functionality.

Use the right detergent and rinse aids

Using high-quality dishwasher detergents and rinse aids can improve cleaning results and prevent buildup inside the appliance.

Check spray arms for blockages

Food particles can clog the spray arm holes, reducing water flow. Remove the spray arms periodically and rinse them under running water to clear any obstructions.

Know your appliance’s model number

Understanding your dishwasher’s specific model is essential when searching for parts or troubleshooting problems. If you’re unsure where to find it, our guide on how to find your appliance’s model number can help.

Replace worn or damaged parts promptly

If you notice any damaged seals, hoses, or other parts, replace them to prevent leaks and further issues. You can find a wide selection of dishwasher parts on our website to help you make the necessary repairs.

Empower yourself with DIY appliance care

Understanding and maintaining your dishwasher doesn’t have to be complicated. By implementing a high loop and performing regular maintenance, you can ensure your dishwasher operates efficiently and lasts for years to come. Taking these small steps not only saves you money on repairs but also gives you the confidence to tackle other appliance-related projects around your home. If you encounter any challenges or need further guidance, don’t hesitate to reach out to us. Our team at AppliancePartsPros.com is here to support you with expert advice and quality parts. Explore our extensive repair help resources for more DIY tips and solutions. We hope this guide has provided valuable insights into the importance of a dishwasher high loop and how it benefits you. Remember, a little knowledge and effort can go a long way in keeping your appliances running smoothly. Stay connected with us for more appliance tips and updates. Follow us on Facebook and Twitter to join our community of DIY enthusiasts. If you have any questions or need assistance with your dishwasher or other appliances, we’re here to help. Contact us at any time, and we’ll be happy to support you on your DIY journey.