Installing a Dishwasher Water Filter

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In this post we cover how to install a dishwasher water filter. These are realistic instructions that the average person can actually do. No steps are skipped and this is a great starter project for any up and coming DIY’er.  It should take approximately 1 hr to complete this project.  Here are the materials and tools you will need:

  • Dishwasher water filter kit, replacement compression fitting for the original copper tube (if installed)
  • Channel locks, wrench, drill, screwdriver, copper tube cutter

The dishwasher water filter eliminates virtually all of the deposits and minerals in the water that cause spots on the dishes and in the dishwasher. By using a dishwasher water filter, your dishwasher will be cleaner and you can enjoy spotless dishes, even without rinse agent!

Most filters retail for under $300 and are specifically designed to handle the hot water supply that feeds a dishwasher. Most water filters are intended to be on a cold water supply like you would find for your faucet.  Here we cover the replacement process step by step:

Step 1 – Locate the Dishwasher Filter

The dishwasher filter is going to be located at the bottom of the inside basin. Most of the time you’ll find it under the drain cap in the center of the wash area. It may be off to the side on some models. A quick look at the service manual or the inside of the dishwasher will help you find it quickly.

Step 2 – Purchase the Correct Filter for Your Dishwasher

Before you buy the new dishwasher filter, make sure you know what type to get. Some dishwashers use a triple-layer helix filter, while others use extra-fine filters. Take the information on your make and model to the appliance store and order the correct filter.

Step 3 – Turn the Power Off

Your home may have the dishwasher connected to the kitchen circuit breaker or to one all its own. However yours is configured, turn the breaker off at the circuit. This will ensure the dishwasher is not accidentally turned on while you are working on it.

Step 4 – Remove the Filter Cover

There are two ways the filter cover may be secured to the dishwasher. The first is with a top cover that simply pops off. The other way is through a cover that either screws off or is held down with two screws. Determine which type you have in your dishwasher and remove the cover.

Step 5 – Remove the Old Dishwasher Filter

You will see a cup the dishwasher filter sits in. Grab the handle of the cup and pull straight up. The cup will bring with it the filter and the water line. The dishwasher filter sits in the cup and will come right out.

Step 6 – Clean Out the Filter Basin

If the filter is clogged with small food particles, there is mostly likely going to be some around the cup and basin. Clean this out with a sponge or a rag.

Step 7 – Replace the Dishwasher Filter

Set the new dishwasher filter into the cup assembly. Make sure the water tube is still connected tightly to the cup. Place the assembly back into the basin and snap the cup back into place.

Step 8 – Replace the Cover

Position the cover back onto the housing. Secure it by the screws or through popping the top back on.

Step 9 – Turn the Power On and Run the Dishwasher

Turn the power back on to the dishwasher and run it through a full cycle. Check the dishes to make sure they are clean of any food particles.


TIP: Run your dishwasher when hot water is already available at the kitchen sink. Otherwise it may not draw enough water on its own to pull hot water from the water heater.

This ensures that hot water is supplied to the dishwasher right from the start.After a few cycles, calcium deposits on the dishwasher should be significantly reduced, and dishes noticeably cleaner than without the filter, even without rinse agent.

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