Frequently Asked Questions

What is a MERV Rating?

MERV stands for minimum efficiency reporting value. MERV ratings are an air filter industry standard. The higher the MERV rating, the more particles are captured as well as the ability to filter smaller and smaller particles. While higher MERV ratings are better at filtering, air flow is reduced slightly. Residential furnace filters range from MERV 8 to 13.

How do I install my air filter?

Be sure to turn off the power to your furnace before changing your air filters. Remove the old air filter and discard it. When placing your new air filter into the grille, make sure the arrow on the side of the filter is pointing towards the furnace. Turn your furnace back on.

What is the difference between nominal and actual size?

Air filters are typically measured in inches. A popular filter size is 16” x 25” x 1”. This is the nominal measurement, as all of the lengths are rounded up to the nearest inch. These size filters, if you measured them exactly, are 15 ½” x 24 ½” x ¾”. This is to ensure that the air filter you order fits snugly, but doesn’t need to be shoved into position. It’s better to have a filter that’s slightly smaller than one that’s too big for its compartment.

What is a HEPA filter?

HEPA (high-efficiency particulate arrestance) furnace filters are in a premium-quality class of filtration. To meet HEPA standards a filter typically must remove at least 99.97% of particles that have a size of 0.3 um. HEPA filters are usually used for commercial, industrial, and healthcare applications. However, a HEPA filter can be used for people who suffer from allergies and respiratory issues.

What kind of debris will a new air filter capture?

All air filters will attempt to capture a variety of different household pollutants such as dust, dust mites, lint, and pollen. A MERV 13 air filter will capture those particles plus very fine dust and even bacteria. If you have pets in your home a lot of what is captured in your filter will be pet hair and dander.

How do I choose the correct air filter?

The best way to ensure you get the correct size air filter is to look at your existing air filter. Most current air filters will have the size on the air filter or it will have a part number. If your existing air filter doesn’t have the dimensions listed on the side, you can measure it yourself.  Measure your air filter for length, width and depth. These dimensions are called actual dimensions. Then you’ll need to round each actual dimension up to the nearest inch to get your nominal dimensions which you can then find by searching on our air filter finder.

How can air filters save me money?

Air filters can save you energy costs and maintenance fees. Buy replacing your air filters, you can improve the lifespan of your system. If dust and dirt build up on the filter it can cause the system to have to work harder in order to heat and cool your household/workplace. This can increase your energy costs and increase the likelihood of providing upkeep on your system 

Why should I change my air filter?

Changing your air filter not only helps save money, but it helps increase the quality of your indoor air which keeps your lungs healthy. Air filters trap particles in the air and if particles build up, the air in your home or workplace can become dirty. This can cause sneezing, coughing, wheezing and more to start to occur. By changing your air filter regularly you can provide a healthier environment for you and your family.

What's a furnace filter?

A furnace filter helps remove airborne particles (allergens, dust, etc.). These airborne particles can cause damage to your heating and cooling system, which can decrease the efficiency of your unit. Not only do furnace filters help improve energy and efficiency of your furnace, these filters also help improve of the quality of your indoor air too.

What are humidifier filters?

Humidifier filters are also known as water panels, evaporators or water pads. Humidifier filters are used in a humidifier to help alleviate dry air mostly in the winter time. A humidifier works when warm, unfiltered air is blown across a humidifier filter, which is saturated with water. As the air passes over the filter, it picks up moisture and distributes the humid air into the room or through the HVAC system. Find out more about humidifier filters.

Why do you need to change your air filter?

All air filters should be replaced every 3-6 months. The reasoning for changing air filters is to help improve your indoor air quality. Many air pollutants can be found in your home, such as radon, dust, smoke, chlorine, asbestos and more. By changing your discount air filter you can reduce the likelihood of these particles existing within your indoor air, allowing you to breathe cleaner and possibly helping reduce illnesses.  

How to clean reusable air filters?

To clean your reusable air filters, follow these easy steps:

  1. Find your air filter and remove it.
  2. Use a brush or a vacuum to remove the debris that has built up on the air filter.
  3. Place the filter in a tub, bucket or sink filled with water and a little bit of vinegar. Let the filter sit in the water for about an hour.
  4. Once the hour is done, let the filter dry. (Place a towel under the air filter or let it dry in direct sunlight.)
  5. Place the filter back into your unit.

Which way does my air filter go?

Our filters are made and packaged to provide the correct instructions on the direction that your air filter should go in. Typically there will be an arrow on the side of the filter which will indicate which way to insert the filter.

What are washable air filters and how do I use them?

Washable air filters are different from your average air filter. These filters are made out of woven polypropylene media and heavy-duty steel, which can be used for heat pumps, sensitive furnaces and any systems with limited air flow. Washable air filters are also eco-friendly and cost effective for homeowners due to their material. Most air filters need to be changed every 3-6 months, where washable air filters can last up to 5 years or a lifetime (if maintained and washed properly). Make sure to wash your filter every 3-6 months for optimal performance.

How do I measure my air filter?

Measuring your air filter is easier than you think. One of the best ways to find the size of your air filter, is to check the outside of the filter to find the part number and size. The other way to find the size of your filter is to measure it yourself. The measurements of the air filter go by length, width and depth. It’s also important to know that the length and width are interchangeable. For example, if your filter is 14 X 20 X 1, it can also be 20 X 14 X 1. Be sure to measure your air filter to the nearest whole number in order to find your correct size.

I bought the wrong filter, can I exchange it?

Unfortunately we do not offer exchanges for products at this time. If you wish to return a filter, contact Customer Service for a return label or complete the form here. Once you have the return label you can return the product, get your money back and buy the correct filter.

  1. Product must include original packaging.
  2. Custom made filters are non-refundable.
  3. Returned items should be in the same condition that you received them.
  4. Once your return is received and inspected we will process it within 7 days.
  5. Note that your credit card company may not post the credit to your account for an additional 2-10 business days.
  6. We reserve the right to refuse any returns.

How do I process a return?

All returns are free. To make a return, complete the steps below.

  1. Fill out the return form (click here).
  2. Once completed we will email you a shipping label.
  3. Once received you just need to print it and apply to your shipping box and mail.
  4. Once your return is received and inspected we will process your return.

When I make a return, when should I expect my money?

When you make a return, you will have to wait until we receive and inspect the product. Once this process is completed, you can expect to get your money back within 7 days. Note that your credit card company may not show the returned amount for 2-10 business days.

What are my shipping options?

Our primary shipping method is a hybrid service between major parcel carriers and the US Postal Service. With our free free standard shipping, your order should arrive within 2-10 business days.  We also offer $6.99 Ground shipping, which will deliver your order within 1-5 business days.

How soon will I receive my order?

Your order should arrive within 2-10 business days.

How do I track my order?

To track your fridge filter or air filter order, click here.  Then enter your order number and ship to zip code and you will receive an email containing a secure link to view your order.

When will my filter be shipped?

We provide same day shipping for orders placed before 2pm (EST). If your order was placed after 2pm, you will be sent an email letting you know when your order has been shipped, as well as when your order is expected to be delivered.

How does the subscription service work?

Auto-Delivery is a subscription program and is the easiest way to guarantee you always have Discount Filters products that work for you when you need them, where you need them, always at a great price and a set shipping schedule.

  1. FREE SHIPPING on all orders after your first.
  2. Complete Control. Customize your delivery dates based on your personal use of your favorite products. You call the shots!
  3. Convenient Automatic Shipments: You'll never have to worry about reordering filters again.

What type of payments do you accept? offers multiple payment options. We accept all major credit cards (VISA, MasterCard, American Express and Discover). We also accept payments via PayPal, Amazon, Google and Apple pay where applicable. Unfortunately at this time we do not accept payments via check or money order. 

How do I know which water filter I need?

When you use our fridge filter finder, we help you figure out which water filter is right for your refrigerator. As long as you know your refrigerator brand, model, the location of the filter, and how it unlocks, we’ll lead you to the correct refrigerator water filter.

What’s the difference between OEM & aftermarket filters?

An OEM or original equipment manufacturer product is made and sold by the same manufacturer as the original equipment. An example would be Maytag’s UKF8001 water filter that comes standard in Maytag refrigerators. Aftermarkets are made by many different manufacturers and are designed to replace the original product. Aftermarkets usually possess quality comparable to the OEM, at a lesser cost.

How do I install my fridge filter?

Installation steps depend on what type of refrigerator water filter you have. Most filters usually require unlocking the old filter by rotating it counterclockwise, pulling it out, and then turning the new filter in the opposite direction to lock it. But, we have specific installation instructions on each product page.

How do I reset the filter change light on my fridge?

Contrary to popular belief, filter change lights have nothing to do with a faulty water filter. These lights are actually set on a timer. The average fridge filter life is 6 months, so after resetting, the light is designed to turn red 6 months later. Resetting your filter reset light will vary on the refrigerator brand and model.

How often do I need to change my water filter?

The average life of a water filter is 6 months or 500 gallons of water, whichever comes first. Most likely, you aren’t counting gallons so 6 months is what most people go by. Depending on how harsh your tap water is, you may need to replace your refrigerator water filter sooner. If you notice a change in the smell, taste, or look of your filtered water, the filter most likely needs to be replaced.

What does activated carbon mean?

Activated carbon is a specially processed form of carbon used for filtration purposes. This activated carbon comes from a few different natural materials such as coal, coconut shells, and wood. After being exposed to an oxidizing agent, the carbon becomes activated and attracts small particles. Its surface is made of many tiny pores, increasing its overall surface area significantly.

What kind of contaminants are in my drinking water?

Your tap water is susceptible to many different contaminants during its journey to your fridge. Water treatment facilities are designed to disinfect your water to remove waterborne pathogens. However, minute traces of chlorine can still be present in your drinking water, leaving a weird aftertaste. According to the EPA, herbicides, copper, asbestos, dirt, sediment are just to name a few of the contaminants that can be found in your drinking water. 

How do I find alternative water filters?

To find alternative filters, type in the name of your current filter into our ‘Find a filter’ search bar (located at the top right of the page). Your filter will appear on the screen below and you will need to scroll down to the ‘Cross Reference’ section of the page. This section has all of the alternative filters that can work to replace your current filter.

Do water filters have an expiration date?

Most of our filters have an expiration date of six months to a year. The lifespan of a filter can fluctuate due to the amount of water that passes through. If filters are not replaced for a long period of time, it can stop working properly and allow for bacteria to build up inside the filter or other contaminant to get into your drinking water. Be sure to pay attention to when your filter needs to be replaced for optimal performance.

Can I get a disease from the drinking fountain?

Many people believe that drinking fountains contain thousands of germs and chemicals on the spigot and in the water. However this is not true. The most germs that humans encounter when drinking from a water fountain are those parts touched most by human hands (i.e. push button, sides of water fountain, etc.). Therefore you cannot get an actual disease by drinking from a drinking fountain.

What is an OEM refrigerator water filter versus an Aftermarket filter?

Many people may think OEM and Aftermarket products are the same, however, they are quite different. OEM stands for Original Equipment Manufacturer. These are the products that the original company has made, for instance, an OEM Whirlpool filter is made by Whirlpool and is typically heavily tested to meet NSF/ANSI standards and certifications. Aftermarket water filters are produced by other companies than the original maker. One of the main differences between these two types of products is that Aftermarket products tend to be less expensive and has the same quality of OEM products.

How to a flush fridge water filter?

It is important to flush your fridge water filter before you put it to use. The reason for flushing the filter is to activate the carbon in the filter, which then traps harmful pollutants in the tap water from getting into your drinking water. Follow these easy steps to flush your filter:


  1. Find a large bucket or container (one that can fit the water dispenser or filter for the fridge).
  2. Place 1 gallon of water in the container. (If you are using cups: four cups equal one quart and four quarts equal one gallon).
  3. Run the water through the filter. Submerge the water filter in the water.
  4. Repeat steps 1-3 until you have flushed 3-5 gallons of water (you will need to run 3-5 gallons of water before using your filter)
  5. Once the water has gone through the filter, discard the water into the sink.


**If your refrigerator doesn’t have a water dispenser, discard by using two batches of ice.


Find out more on how to flush your water filter, from this post.

Why do you need to change your water filter?

Water filters should be changed every 3-6 months. The reasoning for these fridge filters is for them to trap large contaminants and prevent them from getting into your drinking water. Over time, these impurities can start to build up and eventually cause several health issues. Water filters help reduce the amount of impurities found in drinking water to leave your family with safe, clean and great tasting water.

What is the NSF/ANSI certification?

Many products can have multiple certifications. We have a certification for water filters that is the NSF/ANSI.  After the product has been tested and verified to operate at high standards; the NSF/ANSI certifications assure that your water filter is fit for use in the USA, Canada, and Many other countries. If a product holds this certification, rest assured that your water will be safe to drink.

How do I reset my refrigerator filter light?

To reset your refrigerator filter light, follow these easy steps:

  1. Locate your filter
    1. Amana – Press the “Auto” and “Dispenser Lock” buttons and hold until the water filter status indicator light flashes.
    2. Frigidaire – Press the “Reset” button and hold. This causes the indicator light to flash.
    3. GE (General Electric) – Press and hold for 10 seconds the “Reset” button.
    4. HotPoint – Press and hold for 10 seconds the “Reset” button.
    5. Jenn-Air – Press the “Light” and “Lock” buttons and hold. This lasts for about 5-10 seconds or until the filter light flashes.
    6. Kitchen Aid – Press and release the “Light” button 5 times quickly.
    7. Maytag – Press the “Light” and “Lock” buttons and hold. This can take up to 5-10 seconds or until the filter light flashes.
    8. Samsung – Press and hold the “Ice Type” and “Child Lock” buttons at the same time for 3-5 seconds. (Ice Type can be ‘Cubed’ or ‘Crushed’).
    9. Whirlpool – Press and release the “Light” button 5-6 times quickly. This looks like a small plunger, and is located at the top or bottom of the door (i.e. where the door closes).
  1. Flush water through the filter. These will help activate the carbon in the filter to make sure it will trap harmful chemicals found in your drinking water.


In general, the filter light allows you to know how the filter is working. If the light is green, the filter is working properly and does not need to be changed. If the light is yellow, the filter is in the middle of its life expectancy. Once the filter is red, it is time to change your filter soon.

Do refrigerator water filters work?

A common question is do refrigerator water filters really work? The answer, absolutely! Water filters work by removing a large portion of harmful contaminants that can exist in your tap water. Tap water can contain lead, rust, sediment and many more pollutants in it that can undetected by our sense. Refrigerator water filters use their highly advanced technology, activated carbon, to remove these impurities to leave your household with fresh, clean and healthy water. To ensure a filters optimal performance, replace the filter every 3-6 months.

What are the contaminants in my drinking water?

There are thousands of chemicals that can be found in your drinking water. Most people don’t know where these chemicals come from or their potential health effects. To help, we created a water contaminants list provided by the EPA to show you the chemicals and how to keep your household save.