7 Best Water Separator for Air Compressor [Buying Guide]

If you are on a quest to search for the best water separator for an air compressor, my friend your wait is over!

Because we have done elaborated research and have amalgamate information for you to help select the best water separator.

To provide you the ease: Below, I have discussed a few of the best water separators so that you can select the absolute perfect product for yourself!

Do you know what the problem is? Although, a substantial amount of water comes from ambient air from which the water is squeezed out.

Hence, these air compressors contain water separators, and their main purpose is to separate free water from the air.

Furthermore, there are so many different trade names available, and more or less, the qualities of the product are somewhat similar.

However, sometimes, it is quite difficult to make a decision. It is mind-boggling to find the right product.

So, providing you with the Solution to Overcome Your Problem: However, this extensive guide will aid you in choosing the right water separator for your air compressor in order to stop the accumulation of water.

Comparing 7 Best Water Separator for Air Compressor 2021

No matter how much you try, sooner or later, the water will end up in your compressor.

As a result, when the water reaches the compressor’s interior, the internal parts become rusty over the course of a short time.

Ultimately, it makes it harder for the lubricants to reach these certain areas, and it causes the performance of the compressor to decline.

Everybody wants to buy the perfect product without wasting their money.

So, remember! Buying a water separator is mandatory because moisture is the last thing you need.

So, for you, I have collected all the information about these 7 best water separators for an air compressor that can help you provide all knowledge with its pros and cons.

Now, Without further ado, let’s jump right into it.

Water SeparatorWeightMaterialStyle (NPT) 
THB 1/2" Particularr Filter1 lbMetal1/2 Inch Check Price
EDGE 3/8" Line Air Dryer1.85 lbAluminum3/8 Inch Check Price
THB 3/4" Heavy Duty Filter1.6 lbAluminum3/4 Inch Check Price
Le Lematec Air Filter0.25 lbAluminum1/4 Inch Check Price
Campbell Hausdeld Air Filter0.5 lbSteel3/8 Inch Check Price
Made in Taiwan 3/8" Air Filter1.85 lbSteel3/8 Inch Check Price
PneumaticPlus Air Filter0.8 lbPolycarbon3/8 Inch Check Price

1. 1/2″ Particulate filter – Enjoy a Low Cost but Effective Water Separator Now

THB 12 Particularr Filter, water separator for air compressor


This metal and polymer filter helps to remove moisture from the airlines on single-stage air compressors.

Moreover, it consists of a drain that is semi-automatic. And it behaves and functions as an overnight drain.

Not only this, but there’s more: However, the exertion of pressure on the bowl will cause the drain to hold all the moisture contents.

On the other hand, if the situation is opposite, i.e., if there is no exertion of pressure on the bowl, this will cause the drain to open automatically.

Besides, the designing of this filter is done in such a way that after exerting pressure on the bowl, it will be able to hold the moisture contents.

Beginning with compressed airlines is the most authentic way to disparate moisture and air. Remember, to always push air to clamber vertically.

Hence, the liquid moisture that is pooled up will be pushed downwards through gravity.

Also, it contains a ½-inch particulate filter to eliminate moisture.

Moreover, it comes with a metal bowl guard, also a polycarbonate bowl.

This product also contains 5 microns filter, which helps to eradicate 95 percent of the debris and moisture.

  • Less expensive.
  • Readily available replacement filters.
  • It contains a semi-automatic drain.
  • Easy to install and operate.
  • Reliable quality, I.e., metal, and polymer.
  • It may not trap moisture well.
  • A plastic bowl may leak after some time.
1/2' Particulate filter water trap seperator moisture Compressed...
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1/2" Particulate filter water trap seperator moisture Compressed...

2. 3/8″ in LINE Desiccant AIR Dryer – Great Filter for Plasma Cutter and Spray Booth

EDGE 38 Line Air Dryer


This separator aids in eliminating the moisture or condensate from the air compressed lines.

Thus, using this filter is extends the life of pneumatic equipment and tools. Moreover, it consists of a 3/8 – inch NPT female inlet and outlet.

In addition, this desiccant air dryer has a maximum air pressure of 150 PSI.

Also, this filter comes with a bowl made with polycarbonate and an aluminum metal guard. Besides, this polycarbonate bowl is transparent, so it makes it easy to view bead moisture.

Another amazing quality is: Desiccant beads come in two bags. Once these beads are ready to change, they become pink in color.

  • Works perfectly for painting small projects.
  • Dries the air nicely at a reasonable price.
  • Easy to install.
  • Easy to utilize.
  • Only removes moisture.
  • It may not include mounting brackets.

3. 3/4″ Heavy Duty Particulate Filter – A Moisture Separator with an Auto Drain System

THB 34 Heavy Duty Filter


Like the other two filters, this filter also removes debris and moisture from the compressor airlines to increase the life of your compressor accessories and tools.

Plus, this filter is heavy duty and can work in both higher and lower pressure systems.

Also, it consists of an automatic drain that will drain debris and moisture from the metal bowl automatically.

In addition, it consists of a 1/8-inch male NPT auto-drain connection and a 3/8-inch female outlet, and an inlet port containing a five-micron filter element.

And you will be pleased to know that: The metal bowl has a sight glass to view the moisture level easily.

Besides, this filter protects from oil, dust, moisture, and dirt. Dust decreases the equipment’s performance, and when amalgamates with oil, it creates a sticky mess in a valve’s interior.

  • Comes with wall mounting bracket.
  • Maintenance-free.
  • Easy installation.
  • Drains water well out of the airline.
  • It might leak sometimes.
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  • 3/4" Female NPT Air Inlet port X 3/4" Female NPT Air Outlet port
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4. Air Compressor Filter and Water Separator – A Versatile and Reliable Filter to Try Right Now

Le Lematec Air Filter


Accuracy is one of the most essential factors when it comes to working with an air compressor, and it is a challenge most of the time.

However, you also need efficacious accessories for the air compressor to obtain top-notch results.

Let’s know about the manufacturing and Designing of this filter: The manufacturing and designing of this airline filter are done in such a way that it can provide numerous functions, such as it is proficient in trapping water, dust, and oil in one unit.

Which is beneficial for both professional and personal use, and also provides outstanding performance.

Moreover, this airline Filter can reach the maximum operating capacity of 150 PSI, and no matter which pressure settings you set this filter on, it will work efficiently.

This filter has a standard operating pressure of 90 PSI, and it works best when it is set between the ranges of 25 to 150 PSI.

However, by using this product, it makes the process of air purification convenient and effortless by removing and integrating all the unwanted particles, i.e. dirt, water, and oil from the air.

In addition, it also consists of a ¼ – inch standard female and male air inlet.

Moreover, these inlets make it easier to work in any position. In most of the air tools, it fits, hence providing you with the utmost convenience.

Let us know about more functions of this Air Compressor Filter:

So, you can utilize this universal or multipurpose airline filter as an air compressor filter dryer for cutting, blasting, and sanding.

Although, if you are tired of making predictions and guessing which way the air will flow after installing this product, then do not fret.

Also, this filter comes with an airflow indicator that will guide you in setting up an air dryer filter.

In addition, this filter also provides a system for draining in a less hassle way. Well, every water separator works quite the same, but you have to choose the right one for your air compressor so that you can utilize it for an extended period.

Furthermore, to provide ease in cleaning, there is a push-button drain valve, which is built in an air compressor dryer.

So, you can also easily take out the filter element, clean it, and use it again, and this is one of the additional benefits of buying this product.

  • Three (water, oil, and dirt) in one filter.
  • Less expensive.
  • Built and designed with durable material, i.e., brass.
  • It provides a money-back guarantee.
  • Compatibility with all the models of air tools and air compressors.
  • Cost-effective.
  • Shock-proof and can withstand different temperatures.
  • Reusable filter making it economical.
  • Specialized push button drain system.
  • It has an indicator that guides airflow.
  • Contains crucial feature, i.e., Teflon tape.
  • Might significantly restrict airflow.
  • Might not drain water unless it is over 40 PSI.
  • It might be possible for the water to get filled very quickly and can get in the line.
Le Lematec AI303-C1 Air Compressor Filter Oil Water Separator...
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5. Air Filter, 3/8″ NPT – Providing an Exceptional Filtration and Includes a Quick-Release Bowl

Campbell Hausdeld Air Filter


The main purpose of this filter (PA212103AV) is to protect or safeguard the equipment and tools by eliminating the contaminants, which are either solid or liquid.

Moreover, the contaminants, the Campbell Hausfeld cleaner helps to remove are dirt, pipe scale, dust, bulk oil, rust, and liquid water.

In addition, this brass filter contains a 5-micron filter, which aids in eliminating the scantiest of particles.

Also, this product has two most important features, which are a quarter-turn drain, and a quick-release bowl to provide ease while using.

  • Quick-release bowl: Metal guards are used to protecting the bowl, and the main motive of this see-through bowl is to view the level of fluid with ease.
  • Quarter-turn drain: It aids in making the maintenance trouble-free and painless.

In addition, the Campbell Hausfeld air cleaner and/or dryer system provides other merits as well by cleaning the air, and removing water vapors. It consists of two disparate systems which are as follows:

  • Filter for oil removal: It traps about 99.9 % of oil aerosols.
  • Desiccant system: It aids in removing water vapors.

Furthermore, there is an outlet screen that does not allow the desiccant particles to enter an airstream; thus, it ultimately protects the air tools.

Besides extending the life of air tools and removing filtration, it provides a flow capacity of 57 SCFM at about 90 PSI.

On the other hand, it also contains a 3/8 – inch NPT filter ports.

  • Eradicates water vapors, and cleanses air.
  • Keep applications free from oil, moisture, and other debris.
  • Easy to install.
  • The quality is outstanding, i.e., steel.
  • Fits and works perfectly.
  • The drain valve might not work properly.
  • The see-through bowl is made out of plastic and it may crack over time.
  • The drain is made out of plastic and it may break easily.
Air Filter, 3/8' NPT wit Quick Release Bowl (Campbell Hausfeld...
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  • The cleaner/dryer system includes a quick-release bowl for easily...
  • An oil-removal filter traps 99.9 percent of all oil aerosols and a...

6. 3/8″ Compressed Air in Line Filter – Newly Designed Filter With Desiccant Dryer

Made in Taiwan 38 Air Filter, air compressor water separator


Like all the above filters, this filter also does a fantastic job of eliminating humidity, water, and oil from the compressed air.

Also, it consists of a brand new or a pristine 3/8 – inch female NPT desiccant dryer unit to filter moisture from compressed air.

Want to know more about this amazing product? This filter comes with two refills of the desiccant beads. The main objective or purpose of a desiccant bead dryer is to eradicate humidity and water within the compressed air.

When the desiccant beads become saturated, and there is a need to change them, they signal by changing the color from blue to light pink.

In addition, this filter has a quick-release bowl. This bowl helps to provide ease in maintenance, and it is also clear to view the contents easily.

Also, the bowl contains a metal guard, which aids in providing protection.

So, it is a great filter for sandblasting, painting, and plasma cutters.

The maximum pressure of Compressed Air in Line Filter Desiccant Dryer Moisture Water Separator is about 150 PSI.

This filter has a directional flow, and marking has been made on the product. Each port of the filter is also marked as in and out.

  • Easy to use, works very well, and helps to keep the air dry.
  • It creates no leaks.
  • Filter comes with two refills.
  • Three (humidity, oil, water) in one filter.
  • It contains a desiccant bead dryer.
  • It has a directional flow, and it is marked.
  • It is quite expensive.
  • The absence of mounting brackets and holes might create a problem.
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7. Compressed Air Particulate Filter – Moisture-Sensitive and Easy-to-Use Filter

PneumaticPlus Air Filter, one of the best water separator for air compressor


Pneumatic Plus is a filter that offers an efficacious solution to filter out particles or contaminants, and moisture from your airline.

Pneumatic Plus filters of the SAF series have a standard 10-micron element. Like other options, this filter also offers 2, 5, 20, and 40 microns.

In addition, it also provides the option of choosing a bowl, either you want metal or polycarbonate.

Furthermore, it also provides options for choosing the drain, whether you want a manual or automatic.

The outlet connection size of this filter is 3/8 inches, and the outlet connection type is NPT.

Therefore, these kinds of filter design allow to connect or join with SAR series regulator/SAL series lubricator to finish and finalize the FRL (Filter Regulator Lubricator) unit.

Moreover, the maximum pressure this filter can withstand is about 250 pounds PSI, and it can reach the maximum working pressure to about 150 PSI.

  • Has the standard 10-micron element.
  • It provides an option of a manual or automatic drain.
  • Gives options for metal or polycarbonate bowl.
  • A good filter/dryer creates no leakage.
  • Contain bracket with this filter.
  • Easy process to set up and utilize this filter.
  • It might not come up with adapters for air fittings.
  • The trap might catch some water and oil.
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PneumaticPlus SAF3000M-N03B Compressed Air Particulate Filter...
  • 10 Micron Element Standard
  • Manual Drain & Polycarbonate Bowl
  • 3/8" NPT Female Thread

Best Water Separator for Air Compressor: Buyer’s Guide

Best Water Separator for Air Compressor Buying Guide

The water separators that are mentioned earlier provide basic information on what is available in the market.

Thereby, filters of different companies can create confusion within you.

But you must remember: Water separators are compulsory, and you have to find the ideal water separator for your air compressors because not every water separator will work perfectly.

For your facility: I have collected some basic facts and information based on the queries that can help you buy the filter you opt to desire.

How to Change a Fuel Water Separator Filter?

The purpose of the fuel water separator filter is to remove the contaminants that cause 95% injector failure and fuel pump.

However, correct installation and maintenance reduce costly repairs, costly downtime, and excessive emissions from the exhaust.

Now: What happens is that if they are not eliminated properly out of the system, they can create erosion, pitting of the surface, poor performance, and loss of fuel.

However, inspection and maintenance on a daily basis can lessen or diminish such problems.

Here, the steps are mentioned below, which will help you answer your question:

How to change a fuel water separator filter?

By following this strategy, you will be able to replace the worn-out filter.

Step 1: Detach Driver’s Kick Panel: Firstly, you have to locate or detect the driver’s kick panel. Unscrew the 2 screws from inside the panel and from the firewall. You have to remove four screws in total.

Then, find the final screw, which will be underneath the carpet near the dead pedal.

Furthermore, on the door jamb’s plastic trim, you will find two screws and unscrew them too.

Step 2: Liberate the Pressure: From the driver’s kick panel detach the fuel pump relay. Next, open the gas cap to eliminate the pressure of the residual tank. Now, turn the engine on, and for a few minutes, allow it to run.

Furthermore, to empty the gas tank from the accumulated fuel pressure, start it once or twice or even more until you find the gas tank is completely empty.

Now, attach the fuel pump relay back again and substitute the driver’s kick panel.

Step 3: Disconnect the Hoses: Below the fuel filter, place some bits and pieces of cloth so that it can catch any emitting fuel. Also, place a drip pan underneath the filters.

With the help of a wrench, unfasten hose pipes that are used for fuel. Drain oil from the drainpipe after disengaging the hoses.

Step 4: Disengage Fuel Filter and Fuel Water Separator: Filters are held by brackets. Raise the filter after disconnecting it from the brackets.

Moreover, do the inspection of the fuel water separator; if you notice any damage, then substitute it with the one that is pristine or in mint condition.

Also, do the inspection of the fuel hoses. On the filter, you will see these hoses attached. If these hoses are in tatters or shabby, swap them with brand new or pristine ones.

Step 5: Installation of the Filter: On the same position, set and fix the filter with its flat side facing towards the engine.

Moreover, secure the brackets back and also connect the fuel hoses. With the help of the clamps screw up and make it more secure.

How to Keep Water Out of Air Compressor Lines?

Many people face the problem, and they continuously ask how to keep water out of air compressor lines? Or how can you prevent the entrance of corrosive water into the compressed air system?

The easiest methods are after-coolers, drip legs, coalescing filters, and/or water traps. Usage of these devices helps in eliminating liquid contaminants out of compressed air.

This explains that if cooling reoccurs, condensation occurs due to the increasing amount of water. Therefore, you will be able to visualize it at points used the most.

Examples are as follows:

  • The progression of compressed air taking place through pipes causes extra cooling.
  • During the winter season, pipes on the outside wall are usually cold.
  • Passing of compressed air via refrigerated/cooler air.

Sometimes you may see that water accumulates in air tools and air nozzles. Hence, creating confusion.

What’s really happening here?

The cooling effect happens upon the rapid expansion of compressed air.

Thereby, when the cooling effect temperature falls, and it is less than the compressed air dew point. Hence, condensation will take place.

Therefore, the only solution to eradicate the moisture completely from compressed air is by reducing the dew point to a suitable or acceptable level with the help of various air dryers.

Types of dryers you can utilize to reduce the dew point from compressed air:

Refrigerated Air Dryers:

This kind of dryer will refrigerate compressed air and will provide about 38 degrees of dew point.

Hence, what happens is that the moisture condenses via the dryer, and then small water droplets converge to form heavier bigger droplets.

In addition, the phenomenon called gravity plays a role by drawing down the cooled, condensed moisture into the moisture trap. It removes this moisture by means of an automated drain.

Moreover, in almost 95 percent of the compressed air installations, these types of dryers are used. These types of dryers are customarily and frequently utilized in sandblasting manufacturing, & automotive industries.

Desiccant Air Dryers:

This type of dryer does its work using the method of absorption. This dryer gives a dew point of about -100 degrees.

Moreover, these types of dryers are frequently used in powder coating labs, electronic manufacturing, and hospitals. Also, these dryers are most commonly utilized in 5 percent of compressed air installations.

Air dryers that are membrane typed:

These dryers use technology based on permeable micro-tube. They are frequently used in applications that are low-flow such as lab environments, dental labs, and point-of-use applications. How Does an Oil Water Separator Works?

In several industrial applications, oil-water separators work to remove solids that are oil-coated, oil, light petroleum, and grease from the wastewater.

Furthermore, several industrial and commercial businesses are entailed to make use of oil-water separators to avert and halt the adverse effects on the environment.

You must be wondering to know that: Actually, how does an oil-water separator works?

Density is the foundation premise, below oil-water separator works. The density of oil is less in comparison to water, thereby, floats on the water surface.

In addition, oil-containing wastewater enters into the tank through the drain, and then it advances and moves to different filters.

Moreover, designing of the filters is done in such a way that it can easily capture solids and other small contaminants of oil that might be lesser than 10 microns in size.

A tank top floats the greater part of oil, where it eventually accumulates and reaches a definite level. Ultimately at this time, it triggers the sensor and informs the operator or a worker to pump the oil out.

After the treatment of wastewater, it is released and ejected out, and it goes into the sewerage system. This wastewater does not contain free oil greater than 10 parts per million.

How to Remove Water from Air Compressor Tanks?

If you are eager to learn how to remove water from air compressor tanks, and each time you observe that your air compressor is inhaling air.

Then you might want to acquire the knowledge of how to drain air compressed tanks.

Then let’s get started: There is an increase in air pressure in the tank, which also increases the space of the inside of the tank.

In the end, the compressed air containing water vapors escalate so much. Due to this, water vapors quickly condense themselves into free water at the base of the tank.

Why do your Compressor Tanks fill with Water?

When the compressor continues to run for too long, and you have not drained the tank, then, sooner or later, your air tank will end up with water.

Therefore, it will lead you to pump water in airlines rather than compressed air.

Possible solution: At the base of the base drain valve, you will see a knurled ring. A knurled ring is a type of ring, which has bumps on it for easy gripping.

In addition, to make the drain valve open, you have to turn the knurled ring in a counter-clockwise direction. Make sure that you open the drain all the way.

When you unscrew the drain valve; the air will start escaping. It may stop afterward, and then you will hear a weird sound of burbling.

Moreover, you might think that the compressed tank is completely drained, but this will not be the case. At the tank’s foundation, you will find debris or water, which is the reason behind the blockage of the drain.

At this time, the compressor tank is not entirely empty. So, be mindful of opening the drain entirely.

Surprise! Surprise!! The content that will drain out from your tank will be of course water, but it will also contain remnants of compressed oil, tank rust, dust, and other numerous filtrates.

Thus, the water that will drain from your compressor tanks will be somewhat thicker, and its color will be brown.

Spoiler alert! This corrosive water from the drain will stain and spoil anything that you do not want to discolor and spoil. So be aware!

When is it Necessary to Drain a Compressor Tank?

According to the general or usual rule, it should be drained after each use.

In addition, when you compress your air, the water will begin to cumulate in the compressor tank.

Thereby, not draining this water will eventually fill up this tank, and it will slowly begin rusting the tank’s interior.

Remember: After each use, you have to keep in mind that you drain your compressor tanks.

How Often to Change the Fuel Water Separator Filter?

You have to change the fuel/water separator filter every two to three years.

Also, it depends upon your amount of usage.

For some people, it might work for a year. Again, it depends on how much work you do.

Moreover, make sure to filter after 100 hours or every season.

Frequently Asked Questions:

Q. Why is there a need to buy Oil-Water separator?
Air compressors generate air condensation, and it is composed of water vapors and lubricants.

Hence, the corrosive water enters into airlines, and then it goes to the cooling, air dryer, and filtration phase during air treatment.

However, it is impossible to separate the oil from water without a separator. Thus, correct, or suitable separation equipment is necessary.

Q. How does pH affect the separation of oil and water?
If the pH factor is higher than 8.5, wastewater containing oil will be emulsified chemically. If so, separation from gravity will not apply.

Thus, for the oil and water separator to work properly, the pH factor needs to be lowered (about 6.8). This is accomplished by adding acid.

Q. What is the job of the coalescing grid in the oil-water separator?
The coalescing grid resembles the honeycomb. However, the grid’s material is oleophilic (oil-loving).

This grid pushes the water forcefully in a to-and-fro motion, keeping it at a distance of ½”. These oil droplets only need to reach ½” to the tank.

On the plastic medium, oil droplets stick together, gather themselves, and travel to the top. These droplets are then removed.

Q. Which substances create problems of odor in an oil/water separator?
There is a likelihood that problems of odor will occur in any separator. Bacteria, especially anaerobic bacteria, are the sole reason.

Moreover, these bacteria are also called anorexic, meaning they are active in the absence of oxygen. They are capable of producing hydrogen sulfide, which produces a stinky smell similar to rotten eggs.

However, this smell is more noticeable when there is no flow for certain days. In order to treat this smell, you can use ozone or chlorine tablets, which are a powerful disinfectant.

Q. What does condensation management mean?
The compression process creates regular production of water from air compressors. Proper moisture removal from airflow is essential.

Therefore, this stops the costly damage of air tools, dryers, gauges, and other components.

Although, the products related to condensate management are reliable to remove and separate condensate. Examples are automatic condensate drains and oil-water separators.

Q. How does the air compressor dryer accomplish its work?
The moisture becomes denser when the air compressor dryer provides high pressure onto the air. The formation of water droplets takes place, which then is removed by the dryer.

Furthermore, it purifies the air by releasing the pressure.

Q. How does water get inside the air compressors?
The greater the humidity, the more water vapor is present in the air. This humid air will pass through an air compressor.

Therefore, as the temperature will change, water vapor will get denser.

Slowly and gradually, these vapors will become water droplets, thus harming the interior of the compressor.

Q. What are the common hygroscopic materials used in dryers?
Some common hygroscopic (desiccant) materials are as follows: silica, calcium sulfate, calcium chloride, and activated charcoal.


All in all, by going through this article, you grasp the idea or you got the gist that water separators are important.

Sometimes it is seen that air compressors produce a lot of water, and if you do not remove this water, it will eventually travel to your air dryer.

Therefore, this water will slowly and steadily rust your steel pipes and will end up acting as a solvent.

Moreover, this corrosive water contains dust, oil, dirt, pipe rust, bacteria, and other contaminants that clog or choke up your components. Hence, reducing the compressor’s performance.

However, nowadays so many varieties of water separators are available, and this can easily create confusion inside of your head.

Therefore, the 7 best water separators for air compressors are described above for you to select the best one for your air compressor.