Are you sick of having to replace the filter on your vacuum cleaner all the time? Do you start to cough and sneeze every time you use it? If that is the case, you need to know about the post-motor filter.

This part of a vacuum cleaner’s filtration system is often overlooked, but it is important for keeping your home’s air clean and stopping allergens from spreading.

In this article, I will talk about what a post-motor filter is, how it works, and why anyone who wants a really clean home needs one.

So, whether you have had a vacuum cleaner for a long time or are looking for a new one, read on to learn why the post-motor filter is so important.

Understanding Post-Motor Filters in Vacuum Cleaners

What is a Post-Motor Filter?

A post-motor filter is a type of filter that is used in vacuum cleaners to catch small particles that would otherwise go back into the air while vacuuming.

It is located after the motor and catches any dust or debris that got through the other filters.

Most post-motor filters are made of HEPA (High-Efficiency Particulate Air) material, which can filter out very small particles like pollen, pet dander, and dust mites.

Importance of Post-Motor Filters

If the post-motor filter is dirty or clogged, less air can flow through the machine.

This makes the machine work harder and use more power.

A dirty or clogged post-motor filter can reduce the suction power of a vacuum cleaner.

When a dirty filter slows the flow of air through the machine, the vacuum cleaner has to work harder to pull air through the machine.

This uses more power and makes the electricity bill go up.

The vacuum motor works too hard when the filter is clogged, which can cause the motor to burn out over time.

Maintenance of Post-Motor Filters

Post-motor filters need to be cleaned or replaced often to keep their suction power at its best and keep them from getting clogged.

How often the vacuum cleaner is used will determine how often it needs to be cleaned or replaced.

Some post-motor filters can be washed and used more than once, while others need to be replaced every 3 to 6 months.

To clean a post-motor filter, take it out of the vacuum cleaner and tap it against the side of a trash can to shake out any dirt.

It should not be washed with water because that could hurt the HEPA material in the filter.

Different Brands and Models of Post-Motor Filters

Different vacuum cleaner brands and models may have different kinds of filters after the motor.

Bissell, for example, sells replacement filters for its Pet Hair Eraser Upright Bagless Vacuum and PowerGlide Lift-Off Vacuums.

Shark, on the other hand, sells a replacement filter for its Rocket Corded Stick Vacuum.

HEPA Filters

HEPA filters are mechanical filters that can catch particles as small as 0.3 microns.

This includes dust, pollen, mold, bacteria, and any other airborne particles that are smaller than 0.3 microns (m).

Theoretically, HEPA filters should be able to get rid of at least 99.97% of these particles.

With HEPA filters, air purifiers can get rid of 99.97% of particles that are 0.3 microns or smaller.

Maintenance of Post-Motor Filters in Vacuum Cleaners

Frequency of Cleaning and Replacing Post-Motor Filter

How often you clean or replace a vacuum cleaner’s post-motor filter depends on how often you use the vacuum and how dirty the area you are cleaning is.

At least once every three months, vacuum filters should be cleaned.

In areas with a lot of foot traffic, the filter may need to be cleaned once a month.

A vacuum’s suction power can be greatly affected by a filter that is just a little bit dirty.

Replacing Post-Motor Filter

For the best performance, the post-motor filter should be changed every six months.

Some filters, on the other hand, can be washed and cleaned with a gentle spray of water from your kitchen sink or hose sprayer.

Filters made of pleated paper or synthetic fiber should not be soaked or rinsed in water.

Instead, they should be left to dry in the air for at least 24 hours before being replaced.

Different Types of Filters

In general, you should change your HEPA filters once a year, your pre-filters every 30 days, and your carbon filters every three to six months.

Some vacuums have pre-filters that are made to catch large particles.

Every three to four months, these filters should be checked or changed.

If the system has a carbon pre-filter, it should be replaced every two to three years.

If the filter or the case that holds it gets broken, the filter should be changed right away.

Using Vacuum Cleaner Without Post-Motor Filter

You can use a vacuum cleaner without a post-motor filter, but you shouldn’t.

If a vacuum cleaner does not have a filter, the motor will be exposed to debris that would normally get caught in the filter.

This can shorten the life of the motor.

Also, the vacuum cleaner may spit out the dust it has picked up, which can make people with allergies sick.

The filter keeps dust and dirt from going back into the air and on the floor.

If dust and dirt keep getting spread around, it defeats the purpose of vacuuming.


Not all vacuum cleaners have a pre-filter for the motor, so the motor has to be protected by the main filter.

The motor sits behind the filter and draws in air and vacuums up dirt.

The filter stops dirt from getting through but lets air flow through.

Without a filter, dirt and other things can get into the motor and damage it.

So, just like you should not run a vacuum without a main filter, you should not run it without a pre-filter.

Using Vacuum Cleaner for Liquids

If you want to use your shop vac to pick up water or other liquids, you will need to change the filter to a foam one.

When used without a filter, some vacuum cleaners will shoot dust and dirt out of the back, while others may get debris stuck in their engines, which can do a lot of damage to the engines.

So, you should always check your vacuum cleaner’s user manual before using it without its filters.

Consequences of Not Maintaining Post-Motor Filter

Not taking care of a post-motor filter can lead to a number of problems.

If the filter is clogged or dirty, it can make the vacuum cleaner’s suction less effective, which can make the suction worse over time.

This puts more stress on the motor and makes it work too hard, which can cause the motor to burn out.

A motor that has burned out will need to be replaced, which will cost more money.

The Importance of Pre-Motor Filter in Vacuum Cleaners

When it comes to vacuum cleaners, the pre-motor filter is an essential component that plays a crucial role in ensuring the machine’s optimal performance.

This filter is responsible for trapping dust, dirt, and other debris before they reach the motor, preventing damage to the motor and prolonging the vacuum’s lifespan.

A clogged pre-motor filter can cause the vacuum to lose suction power, making it less effective in cleaning.

Therefore, it is essential to clean or replace the pre-motor filter regularly to maintain the vacuum’s efficiency.

In addition, a clean pre-motor filter can also improve indoor air quality by trapping allergens and other harmful particles.

Overall, the pre-motor filter is a vital part of any vacuum cleaner, and its proper maintenance is crucial for optimal performance.

For more information:

Pre-Motor Filter: Vacuum Cleaner’s Secret Weapon

Benefits of Using Vacuum Cleaners with Post-Motor Filters

Benefits of Using a Vacuum Cleaner with a Post-Motor Filter

While HEPA filters are effective at removing contaminants from the air, using a vacuum cleaner with a post-motor filter can provide similar benefits.

The filtration system combined with high-quality seals on the filter and motor housing prevents particles commonly found in carpets from ejecting into the air, resulting in serious occupant health concerns.

When you vacuum, you get rid of allergens like dust, dirt, dust mites, and mold, which are all bad for your health.

Cost of Replacing Post-Motor Filters

The cost of a post-motor filter for a vacuum cleaner varies depending on the manufacturer, model, and type of vacuum.

The New York Times says that buying new filters and bags for a canister vacuum will cost about $20 per year.

However, this cost may be different for other types of vacuums.

For example, the price of a commercial vacuum depends on its size, brand, type of material, type of filter, power source, and other features.

Other Maintenance Costs

There are a few things to think about when thinking about how much it costs to keep a vacuum cleaner in good shape.

One thing is how much it costs to buy new filters and bags.

Other costs of maintenance include the cost of replacing worn or broken belts or brush rolls.

Also, some vacuums need to have their filters or brush rolls cleaned regularly for them to work well.

Researching the model and brand of vacuum you want to buy is important to get a good idea of how much it will cost to keep up over time.

Replacing Post-Motor Filters

A vacuum cleaner’s post-motor filter can be upgraded or replaced.

When you vacuum, the post-motor filter helps return clean air to the room.

Many filters can be washed, so you do not have to replace them if you clean them every 3 to 6 months.

Some vacuums have washable filters that you can clean with your kitchen sink’s spray nozzle or the sprayer on your garden hose.

To change the filter on a vacuum cleaner, first unplug the vacuum from the wall.

There are two filters in your vacuum that catch small things.

Both filters should be checked once a month and washed or replaced every three to six months, or whenever they get dirty.

To find the washable pre-motor filter, take off the Easy Empty dirt tank and press the button on the carry handle that opens the lid.

Take the foam filter out of the tray for filters.

Check this filter often, and when it gets dirty, wash it with a mild detergent.

Make sure the filter is fully dry before putting it back in the vacuum.

The third and final step in replacing a vacuum cleaner filter is to secure it in the filter grid, making sure not to forget any secondary filters that a bagless model may have.

When you are done, just throw away the old filter, close the vacuum, and plug it back in.

Using a vacuum with a post-motor filter can be just as good as using a vacuum with a HEPA filter.

The cost of replacing post-motor filters depends on the brand, model, and type of vacuum.

This is just one of many things to think about when figuring out how much it will cost to keep a vacuum in good shape.

Researching the model and brand of vacuum you want to buy is important to get a good idea of how much it will cost to keep up over time.

Additional Features and Benefits of Vacuum Cleaners with Post-Motor Filters

Type of Filter

One of the most important things to think about with a vacuum cleaner is the type of filter it has.

Small things like dust mites, pet dander, pollen, and mold spores can be taken out of the air by a HEPA grade filter.

This is especially helpful for people who have asthma or allergies.

But it is important to make sure the vacuum is sealed so that unfiltered air does not leak out through bad seals or cracks in the body.

Power of the Motor

The power of the motor is another thing to think about.

A strong motor on an industrial vacuum cleaner makes enough suction to pick up and move heavy debris.

This is especially helpful for people with pets or kids who make a lot of messes.

Noise Level

The level of noise is also an important thing to think about, especially for people who do not like loud noises.

Some vacuum cleaners are made to be quieter than others, which can make a big difference in how easy they are to use.

Design and Structure

The vacuum’s design and build should also be thought about.

How easy it is to move and use a vacuum can depend on its size and weight.

Some vacuums have bendable wands that make it easier to clean places that are hard to get to.

Some have attachments that let you clean stairs or furniture.

Is a HEPA Filter Vacuum Worth the Investment?

Last, you should think about whether a vacuum with a HEPA filter is worth the money.

There is evidence that a HEPA vacuum with well-made seals can improve air quality by getting rid of dust, dust mites, pollen, pollutants, and other things that are bad for the air.

This is especially helpful for people who have asthma or allergies.

But HEPA filter vacuums can be more expensive than other types of vacuums, so it is important to weigh the benefits against the cost.

Note: Please keep in mind that the estimate in this article is based on information available when it was written.

It’s just for informational purposes and shouldn’t be taken as a promise of how much things will cost.

Prices, rates, and fees can change because of things like market changes, changes in regional costs, inflation, and other unforeseen circumstances.


In conclusion, every vacuum cleaner needs to have a post-motor filter.

It makes sure that the air the machine blows out is clean and free of anything that could be harmful.

As the owner of a vacuum cleaner, it is important to maintain and replace the filter on a regular basis to make sure it works well.

But it is also important to think about what vacuum cleaners and their filtration systems do to the environment.

Many filters are made of materials that do not break down, which can add to pollution and hurt the environment.

As consumers, we should try to buy vacuum cleaners with filtration systems that are good for the environment and get rid of filters in an eco-friendly way.

In the end, the post-motor filter is more than just a part of a vacuum cleaner; it shows who we are and how much we care about the environment.

Let us make choices that are good for the environment and take responsibility for them.

We do not inherit the earth from our ancestors; we borrow it from our children.

says an old saying.

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My article on the topic:

Clean Air, Clean Home: Vacuum Filtration 101