Best Inline Water Filter in 2021 – [Tested & Reviewed]

Having an inline water filter means clean, refreshing water at the touch of a button. These easy-to-install filters can connect to your refrigerator’s waterline, and many of them can last for almost a year, so you don’t have to worry about constantly replacing them.

However, finding the right filter while factoring in your budget and specific needs can be difficult. I’ve been in your shoes! After going through quite a few filters myself, I now have a list of the best inline water filter to save you time, money, and, most importantly, your health.

Best Inline Water Filter Reviews

Here are our reviews for the top nine inline filters that will make a great addition to your kitchen or home.

1.Nahla Pure Ultra High Capacity Water Filter


  • Nahla’s under the sink; direct connect water filter system is designed to last for three years and filter 10,000 gallons of water.
  • This unique filtering system also works great for filtering sediments from municipal or well water.
  • Removes 99.99% of all contaminants, odors, VOCs, chlorine, lead, and other heavy metals.


It is highly effective in removing 99.99% of unwanted contaminants in regular tap water. It has leak-proof connections to the cold water line. It is an easy-to-install, high-capacity, low-maintenance filter from a mission-driven company.


The price is higher than other filters. It is also not NFA certified and does not remove fluoride (which is bad if you have excess fluoride in your water) or calcium, damaging coffee pots and harden water.

This is one of the few inline water filters that will actually filter out 99.99% of the contaminants and odor in your water, including ones that are usually left out by other filters of the same type.

In addition to its efficiency, this filter also lasts a long time, and people who use the water that comes out of it to make a coffee remark on how much better their coffee tastes and recommend it to their friends, family, and to you!

Easy Installation
This filter comes with 30-inch long 3/8-inch tubing with three female-to-female adapters, plus easy-to-follow instructions. Even those without any experience installing filters can expect to finish the job in around 10-15 minutes, especially with the inlets and outlets clearly marked.

The flow is a little slower than some other inline filters, allowing water to be thoroughly filtered. The hose quality is like what you would find in a new washing machine; they are virtually leak-proof.

Can Effectively Filter Any Water
While some inline water filters can only filter a few contaminants in relatively clean water, this can treat both well water and municipal water.

It is great at getting rid of all the odors, sediments, VOCs, and toxic substances in water. While it is not an RO system, it can transform water previously not drinkable into clear, tasteless water.

Saves a LOT of Money in the Long Term
While this filter is quite expensive, it can be considered a good bargain because of how long it lasts and what it can do.

A faucet-mounted filter that needs to be changed every 2-3 months would cost well over $1,000 over three years. This one-time purchase will last 10,000 gallons, saving you money and saving the environment from plastic waste.


2. GE SmartWater Inline Filter System


  • This filter is extremely lightweight (13.4 oz.) and does a surprising amount for its size.
  • It comes with a “Twist and Lock” mechanism, which allows you to replace filters effortlessly. Fits standard 1/4-inch plastic or copper water lines.
  • This filter is certified by the NSF and ANSI.


This filter’s value comes from its affordability, ease of installation, and efficient filtering of most contaminants. NSF and ANSI certification is a crucial plus!


The filter lasts less than half a year before requiring a replacement. Some users have reported that the filter makes noise or reduces flow over time.

This smart inline filter system from GE is another product success from General Electric, a well-known, trusted company that has been around for over a hundred years. Its emphasis on quality shows through, and this is no exception.

The filter is designed in a way that allows it to attach to existing refrigerator and ice maker water lines without built-in filtration. It provides safe drinking water and clean ice.

No-Tools” Installation Using the “Twist and Lock” Mechanism
The “twist and lock” mechanism allows anyone to install the filter themselves without any tools. Simply shut off the water supply connected to your fridge and ice maker, cut the tubing, and mount the filter system to the back of your fridge using the provided adhesions.

You can just insert the water line tubing directly into the filter and be finished.

The filter system also comes with a built-in valve that automatically shuts off the water while changing the filter so you can avoid making a mess.

Affordable Price for a Great Product
This filtering system is less expensive than the Nahla filter or reverse osmosis; however, it still does a great job in removing impurities and restoring clarity to your drinking water as it removes dirt and particulates.

It’s also easy to install and lasts for a fairly long time, making it one of the best.

Filters out More Than Most
The water that comes out of this filter is tasteless and clean, free from heavy chemicals, especially chlorine.

The micron rating is 0.5, indicating that tiny particles often missed by other filters can be removed.


3.Woder Ultra High Capacity Inline Water Filter


  • Lasts 3-plus years and filters 10,000 gallons of water.
  • Removes 99.9% of contaminants such as lead, heavy metals, chlorine, mercury, PFCs, TMHs, VOCs, and many more and tastes and odors.
  • Materials tested and approved by ANSI standards, made in the USA.


This is another affordable option that comes in two sizes of water supply lines and is super easy to install. It also removes a large number of contaminants found in regular tap water.


It does not fit braided hoses. It is also not suitable for use with well water or municipal water that has not been properly treated and disinfected.

This Wonder water filter can filter out 99.9% of the most common contaminants found in regular tap water. However, what makes this filter different is that it leaves naturally occurring minerals, such as calcium, sodium, and potassium in the water.

By selectively filtering substances in water, this filter ensures that the water and ice you get will be great for you. The fact that it comes in two sizes ensures that you have the perfect match no matter your water line size.

Selective, High-Performance Filtration
Besides removing 99.99% of most impurities in tap water, making it among the best filter water you can have, this filter leaves in what’s good. It has all the minerals that you want to find in mineral water while tasting clean and crisp.

The selective filtering works via a granular formula using six different media in the filter, each with pore sizes ranging from fairly large to nano-sized. The media are blended rather than layered, attracting harmful chemicals while leaving the good minerals alone.

Quick, Easy Installation
This filter is absurdly easy to install. It can be completed in under five minutes. It involves cutting your pre-existing water supply line and fitting the tubes into the inlet and outlet as indicated in the instruction manual.

Some users have said that turning off their old water supply was even harder than the actual installation.

Clean Water Without Compromising Water Pressure
With a flow rate of 3 GPM at 65 psi, it is a smooth-flowing filter that does not require you to wait forever as you fill your cup or coffee pot.

A few users have even connected the filter to a hose to wash their car and gotten it cleaned with no residue or deposits.


4.Culligan IC-EZ-4 EZ-Change Inline Filtration System


  • Culligan’s IC-EZ-4 filtration system comes from a line of filters based on the level of filtration.
  • The RC-EZ-4 is the most advanced of four interchangeable filters from the system.
  • Meets NSF/ANSI Standard 42 for the reduction of chlorine taste and odor, chloramines, and particles belonging to the nominal particulate class I and
  • NSF/ANSI Standard 53 for reducing cysts, mercury, lead, VOC, MTBE, and turbidity (0.5-micron rating).


Different levels of filtration mean there is a suitable system no matter what your needs are. The filter is also NSF/ANSI Standard approved for TWO standards.


It has a fairly short lifespan and requires constant replacement of cartridges before finally replacing itself. Some parts may have been manufactured in China. It’s not worth the price.

The Culligan IC-EZ-4 EZ-Change Inline Filtration System fits into your refrigerator and ice maker to filter out 99.99% of particulates and toxins included in Standard 42 and Standard 53 of the NSF/ANSI Guidelines.

The system itself lasts for 3,000 gallons, while the cartridge must be replaced every 500 gallons. Installing this filtration system requires a dedicated faucet and may require more effort than previously mentioned inline filters.

Mess-Free Cartridge Replacements via EZ-Change Mechanism
The EZ-Change mechanism is a twist-on, twist-off filter design to make filter replacements super easy.

The quick-connect fittings allow you to change to a new filter within a matter of a few moments without making a mess or risking leakages.

Multiple Series Based on Level of Filtration Required
While the most basic filters from the IC-EZ line only remove bad taste and odor, including the aesthetic removal of chlorine taste and odor, the IC-EZ-3 removes sediment, lead, and cysts besides.

The IC-EZ-4 tops all that off by further removing chloramine tastes and odor, MTBE, VOCs, and mercury. This gives you filtration options depending on your needs.

Install to a Dedicated Faucet
One unfortunate thing about this Culligan filter is the need to install it to a dedicated faucet, and it’s a slightly more complicated installation.

A pre-existing opening such as that for a soap dispenser is often needed. Additional steps are required to screw on the filter system below the faucet and to connect the cold water line and supply adapter to the filter. Installation is estimated to take around 30 minutes to an hour.


5.Watts Inline 20,000 Gallon Water Filter


  • Low-maintenance, connects easily to existing plumbing via 1/4-inch brass connectors. Female adaptors also accept 1/4-inch male fittings.
  • Highly affordable charcoal filter with a 20,000-gallon capacity.
  • WQA certified for reducing chlorine taste and odor and scale buildup from bacteria due to bacteriostatic properties in the filter.
  • Very versatile. It can be installed and connected to refrigerators and campers, boats, and commercial coffee makers.


This is one of the most affordable water filters that help eliminate odors and tastes in your water. It is relatively easy to install and has the greatest filtration capacity we’ve seen thus far.


It only filters chlorine taste and odors while doing little else to remove other contaminants and chemicals found in drinking water. Definitely not suitable for a well or municipal water that has been minimally treated.

The Watts Inline water filter has its seat among the best mainly because it is so affordable and does change the quality of water to a certain degree. The fact that it inhibits bacterial growth means that the filtration system can last 20,000 gallons. Despite being very lightweight, it can still function well after five years without breaks or leakages.

Bacteriostatic Properties and Chlorine Filtration
The Watts filtration system is among the best for filtering out chlorine residues, odors, and tastes and remaining free of bacteria.

Even after five years, the system remains clean and delivers great filtration (though mostly just chlorine) due to its Kinetic Degradation Fluxion mechanism. There is not much change in the quality of ice that is produced using this filter.

Great Bargain Price
For the price, this is a good filter that will improve the taste of your water. If that is all you are looking for and you’re on a tight budget, this is a great option for you.

However, if chlorine has already been removed from your city water and you’re hoping to turn absolutely undrinkable water into “pure” water, this may not be the right filter for you.

Better Tasting Water
Many people who use this filter note a remarkable change in the way their water tastes. Some point out a “refreshing” taste that does not resemble chemicals. You’ll most likely drink more water with this filter.


6.Culligan IC 1 EZ-Change Inline Icemaker Filtration System


  • One of the least expensive inline water filters on the market.
  • EZ change filter replacement system comes with quick-connect fittings so you can change your cartridge in a matter of seconds.
  • NSF/ANSI Standard 42 approved for aesthetic reduction of chlorine taste and odor and nominal particulate class III.
  • The system can last for up to 3,000 gallons (12 months) of water, though cartridges need to be replaced periodically.
  • Requires under-sink installation to a dedicated faucet.


Despite its low price, this filter has received NSF certification and does a little more than just removing chlorine’s taste and odor. It is effortless to replace the cartridges.


The filtration capacity (3,000 gallons) is quite low, and the filter does not filter out lead, mercury, VOCs, or other harmful chemicals and sediments that may be found in tap water.

This low-priced filter offers considerably high-level filtration that meets NSF standards for chlorine odor and taste removal as well as class III particulates, which are 5-15 microns in size.

As mentioned previously for the Culligan EZ-change systems, the installation requires a designated faucet and more extensive installation work that may be challenging for those without experience installing a filter. (It’s still simple enough with instructions.)

Better Tasting Water and Ice
This filter is known to do wonders in removing the funny taste in unfiltered water and ice, making it a great choice for those who just want to improve the taste. This filter definitely gets the job done for simple filtration work and maintains a decent flow rate (0.5 GPM) while at it.

Amazing (Rare) Price
This is one of the most affordable inline filters but still slightly pricier than the Watts filter, considering that the system lasts for only 12 months.

The removal of particles of 5-15 microns also eliminates additional soil, sediments, algae, and many of the toxic substances that would otherwise remain in your tap water.

Install to a dedicated faucet
The IC-EZ line of filters all need to be installed to a dedicated faucet, meaning it’s less versatile and slightly more difficult to install than other inline filters.

However, many people have said that installing the system was a “piece of cake,” so you won’t need a plumber to install it even if you are new to the process.


7.Filtrete Advanced Quick Change Filtration System


  • No dedicated faucet is required. It easily connects to your kitchen or bath faucet.
  • Connects to a cold water supply via a 3/8-inch tube with an easy 30-minute installation.
  • 6-month filter life (2,000 gallons).
  • Reduces chlorine taste and odor and microbial cysts, sand, soil, silt, rust, and sediment by 78%. Tested and certified for NSF Standards 42 and 53.


It is easy to replace the filter cartridges, and the filter system itself lasts for quite a while. The filter also changes the taste and appearance of ice and drinking water in a way that leaves most people satisfied.


Filters out fluoride and chlorine taste and particulates that may be in the water, but not much else (lead, etc.). It may take longer than 30 minutes to install. Also, the flow rate is known to decrease over time.

The Filtrate Advanced Quick Change filter is the intermediate in a line of Filtrate filters ranging from basic to maximum (which filters lead and what is filtered by the advanced filter). It is one of the most effective filters that can significantly change the taste and appearance of water but may not do much on the microscopic level.

While the filter system may take some time to mount against a cabinet wall underneath your sink, cartridge replacement can occur in a flash.

Replace Filter Cartridges with Just a Quarter Twist
Filter cartridges used with the Filtrete basic, advanced, and maximum filter systems can be removed from the filter system with just a quarter twist.

Replacement is required every six months. New cartridges can be inserted into the head bracket and secured with another quarter twist without turning off the cold water valve.

Filter System Can be Mounted on a Cabinet Wall
To install this system, a drill, adjustable wrench, and screwdriver are needed. After clearing the way under the sink, you’ll need to mount the filter system on the wall of your cabinet below your sink. Close the cold water valve and disconnect the waterline.

Next, you’ll be installing a supply line, forming a compression assembly on the other side of the tube, attaching that to the shut-off valve, and tightening all connections with a wrench. Not so easy for a beginner, but not impossible, either.

The full-Flow mechanism Lets You Quickly Fill Your Glass with Clean Water.
One distinction with this filter is its ability to function in full flow. This means there won’t be any difference between the flow rate before and after the filter is installed.


8.GE GXRTDR Refrigerator/Icemaker Filtration System


  • At 10.4 ounces, this is one of the most lightweight inline filter systems we’ve seen.
  • Each filter cartridge lasts for six months with a filtration capacity of 2,500 gallons.
  • Filters and reduces chlorine taste and the odor by 70%.
  • Compatible with refrigerators that do not have built-in filtration for filtering water and ice. Installs directly using refrigerator cold water line.
  • Low-priced option for improving the taste of your water.


Installation is simple and straightforward. The filter can improve the taste and quality of your tap water and ice. The filter is of decent quality and low-maintenance.


This filter only works to reduce the smell and taste of chlorine (and large sediments). A lot of thorough flushing may be required after installation to obtain clear water without the smell of chlorine.

A simple, low-priced filter that is perfect if you want to get rid of the metallic taste in your ice or improve the taste of your water. With this GE filter, it is important to start with water that has already been purified and just requires a little aesthetic touch-up to the taste. The filter does have NSF certification for chlorine removal but will not remove much else.

Simple Economical Design
For its price, this filter works well for removing chlorine odors and taste from the water supply with a noticeable change in both the taste of ice and water.

NSF Class V particulates are removed. At 25-125 psi, water pressure works well with most refrigerators and will not cause leaks.

Reduces Metallic Taste in Ice and Water
Like most inline water filters, the filter is good at reducing the metallic taste of water due to its ability to remove chlorine’s odor and taste.

Some users have even said that they taste absolutely nothing in their water and ice after using this filter for a while.

Thrifty Bargain
Especially for a product from a well-known company like GE, this filter does a lot for its price. With easy direct installation and the ability to filter for six months, it’s clear why this is still the go-to filter for many users.


9.PureWater Inline Water Filter Kit For Ice Makers


  • Easy installation via quick-connect water line adapters and mounting bracket with a screw. Direct installation with most ice-makers via 1/4-inch water line.
  • Specifically designed to work with refrigerator ice makers for improving the taste of ice.
  • NSF certified (Standard 42) for taste and odor reduction plus chlorine reduction class I.
  • The expected lifetime is six months for 1,500 gallons total.
  • Free lifetime warranty and telephone support for defective or malfunctioning parts.


It improves the taste of tap (or even well) water when used to make ice, improving ice clarity and taste. It also comes with a lifetime warranty.


It can only work with a refrigerator ice maker and is insufficient for drinking water out of the faucet. It also only removes chlorine and larger particulates and is too expensive for what it does.

The PureWater is one of the best inline water filter kit is solely designed to work with refrigerator ice makers and further improve water that has already been sanitized, and in most cases, filtered.

Its NSF certification signifies that it will help improve your drinking water quality and health benefits to at least some degree. It is not suitable for well water or minimally treated municipal water.


What to look for When Buying A Inline Water Filter

Before getting your new inline water filter, it is important to know what you are looking for or what you hope your filter will do.

They usually work great in getting rid of the contaminants in your tap water, and the convenience about them is that they connect to your existing supply line quite easily. Since there are many different kinds of inline filters, here’s a list that will help you narrow down your choices.

Types Of Inline Filters

In this review, we’ve actually looked at three different kinds of inline water filters, each with its own pros and cons: charcoal filters, carbon block filters, and granular formula filters, which allow for selective filtration.

Charcoal is a natural material that removes many toxins, including VOCs and chlorine, that pass through the filter. Since charcoal is carbon-based, it attracts carbon-based substances to itself, removing them from your water.

Activated carbon works similarly, providing you with water that has been significantly reduced from impurities and chemicals.

Granular formulas use different materials with different-sized pores to trap various compounds and substances as they pass through. However, they also keep certain minerals in the water because they are not attracted to the materials or are too big to cross over.

Measure Your Water Line

It’s important to make sure that your water line’s size (diameter) fits securely into the inlet and outlet of your filter. Most water lines are either 1/8 inch or 3/8 inch in diameter.

You may also buy a male/female adapter, depending on the filter, if you wish to connect a filter that is not compatible with your measurements.

Installation Process

Make sure you are okay with the installation process required to set up your filter. Especially if it is your first time installing an inline water filter, spend some time watching online tutorials on how it is done to understand better the product you are interested in.

Most companies will also have their own videos to assist with the installation. Most of the filters we mentioned will take at most 30 minutes to install, but be sure about the specifics of installing and maintaining any filter you wish to buy.

The easiest filters to install are those that just require you to cut your pre-existing water line connected to your fridge or faucet and attach them to an inlet and outlet, and then mount the filter on the surface in the cabinet or on the fridge.

Specificities include flow rate, pressure, and even temperature, though you should always connect an inline filter to your cold water line. The flow rate and pressure are important, as a slightly slower flow rate may indicate that the filter is doing its job, while some filters manage to keep the same pre-installation rate (full flow).

Pressure should be checked periodically to avoid leakages from taking place!

Usage And Requirements

While some inline filters must be installed with a designated faucet, others can be added to your pre-existing water supply line in your kitchen or bathroom faucet, so they’re more versatile. They may even be connected to a garden hose so that you can water your plants or wash your car if you so choose.

Some of the ones we’ve included are also designed to directly fit your refrigerator cold water supply so you can have clean, refreshing water and ice using the same filter. Very few filters are designed just for ice makers. It’s also important to match your filtration needs with what is available. No filter will remove every single contaminant or particle from your water, and that’s not really needed.

Yet, depending on your budget and needs, there are varying degrees of filtration available. The most basic filters only filter the taste and odor of chlorine, a common substance in tap water that has actually been added to help kill off pathogens in the water.

The next step is a filter that meets NSF Standard 42, which removes particles 5-15 microns in size. The best filtration system is one that can turn otherwise undrinkable well water into clean water by removing 90% of most contaminants, including mercury, lead, and particles 0.5 microns in size.

More On Budgeting

Some companies set their price really low and then market their product with a nearly impossible filtration capacity or a lifetime. While the 20,000-gallon filter we mentioned may actually do what it should, the only thing that it’s designed to do is to remove chlorine odor and taste from your water.

You may be looking for more from your filter, and in some cases, a different choice may save you the most money and give you the greatest value. It’s up to you to determine which filter is worth the investment.

The Importance of NSF/ANSI Certification

If a filter has received NSF/ANSI certification for a certain standard, does it pass an official test for removing the substances included in that standard? Companies often choose to submit their products for evaluation voluntarily, and they receive a certification if they meet the federal requirements.

For example, the two standards most commonly evaluated in filters are Standard 42 and 53. The first is certified if the filter adequately (over 90%) reduces chlorine, including its odor and taste. Standard 53 further accounts for the reduction of heavy metals, inorganics, and volatile organic chemicals.

On the other hand, an EPA registration requires a company to submit evidential data concerning the materials it uses and the claims it is making. The EPA determines if the two match up and acute or chronic health concerns with the product. If it satisfies all of its claims and there are no health concerns, the product can be registered with the EPA.

Frequently Asked Questions and Answered

What do inline water filters remove?

Inline water filters often remove contaminants commonly found in drinking water, including sediments and chemicals.

Sediments can be categorized by size (0.5 microns being the smallest of particles removed), while chemicals are either organic compounds such as waste products and soil, inorganic compounds, or mercury and lead elements.

In removing these contaminants, these filters also improve the taste and quality of your water.

How do I change inline water filters?

The steps for changing most inline water filters will be similar to the steps used to install them. First, make sure that your water supply is completely off. Place the filter and the connected tubings over a bucket and snap off the tubings.

Connect the water lines to a new filter and remember to flush at least five gallons (unless otherwise specified) of water to eliminate loose charcoal or another residue from the filter. Other filters require you to change the cartridge periodically until the entire system needs to be replaced.

Do I have to clean my inline water filter?

It is recommended that you throw away your filters after their specified lifetime or after their capacity has been used up. Until then, following the installation date, you can just let your filter run on its own. You can also clean the outside of your filter if you’d like.


Now you know what goes into choosing the best inline water filter. We’ve chosen the products in our list based on each filter’s quality, efficiency, and price. Each one is sure to provide you with cleaner and clearer water, with some completely changing the way you drink your water.

The Nahla Pure ultra-high capacity water filter has everything you need in a water filter. From its high efficiency and easy installation to the scope of harmful substances it can remove from your water, and even its company mission, it’s the filter of your dreams!

If the one-time investment is too much for you, I will take a look at the GE SmartWater Inline Filter System, which is comparable across many standards and more affordable. Either way, there’s definitely an inline filter out there for you!

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Bob Allen
About Bob Allen

Bob has been a plumber for 15 years and loves it! He has always been interested in Plumbing from an early age and has the cuts and bruises to prove it as he set out to work with fix leaks, replace faucets, and make home improvements.