Last Updated: July 27, 2020

Inline Water Filters – Review and Buying Guide

Inline water filters are usually placed directly into your water supply pipeline or within a home appliance. This is usually done to save space. Sometimes you will find inline water filters connected to an RO (reverse osmosis) system. In this case the inline filter is used at the final stage of the RO system.

You can also sometimes find inline water filters used in home appliances like coffee makers as well as other small appliances. Especially appliances that have a low flow rate.

As you can imagine, there are many different types of inline filters to choose from. But don’t worry, I’ve got your back. This article will help you select the right inline filter for both your budget and your needs.

Aquasana Undersink Reverse Osmosis SystemWaterDrop Reverse Osmosis WD-G2 SeriesWaterDrop Reverse Osmosis WD-G3-W
OptimH2O Reverse Osmosis Under Sink FiltersWaterDrop RO BlackWaterDrop RO White
- Effectively remove fluoride plus 87 additional contaminants.
- Multi-stage filter INCLUDES ReverseOsmosis + ActivatedCarbon + CatalyticCarbon + IonExchange + Remineralization.
- Filters 5x more contaminants than other RO systems.
- Removes 97% of chlorine and arsenic.
- 99% of lead and asbestos.
- 2 year warranty.
- 90 day guarantee.
- Compact space saving simple tankless design.
- Fast water flow rate of 400 GPD, saving over 300% of water.
- Fills a cup of water in 12 seconds.
- Bacteria and viruses removal .
- Real tankless design.
- NSF 372 & 58 certified.
- DIY installation.
- Free of 400+ chemical substances e.g. BPA, benzene, formaldehyde, cadmium, lead, etc.
- 7 stage filtration.

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Important Things To Consider Before Buying Inline Water Filters

1. Purpose

Inline filters are exactly what the name suggests i.e. the water filter that is plumbed ‘inline’ with your existing water supply line. This means that your water is purified the instant it passes through the filter.

Is this exactly what you’re looking for? Remember there is no on or off option with inline filters. It is always on.

This means that if you prefer every drop of water that comes through your kitchen tap faucet to be purified then the filters will need to be replaced very often.WaterDrop RO White

2. Location

Before buying an inline water filter, you need to decide if you have enough space. Specifically where to mount them.

Most inline filters are around 10 inches long and they are pretty heavy too so sturdy mounts are required. However, most inline filters will come with their own mount.

Aside from the 10 inches for the inline filter and extra space for the mount, be sure to add a few extra inches for space around the unit. Doing this will ensure you have enough space to replace the filters without too much hassle.

3. Replacement Costs

Finally, make sure you know how much it costs to replace the filters. Some inline filters have an artificially low upfront cost only to provide you with very expensive filters. Look at how often the manufacturer says you will need to replace the filters and work out your average annual filter replacement costs. You might find that getting a more expensive inline filter with cheaper filter replacement costs work out better in the long run.

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Watts 5YR Premier Filter Inline Ice Maker Water Filter

Watts 5YR Premier filter is one of the most versatile filters available today. You can use it for your: water cooler, coffee maker, washing machine water fountain, ice maker, refrigerators and even your RV.

  • One of the highest capacity water filters that can filter up to 20,000 gallons of water or last you for up to 5 years.
  • NSF tested and certified meaning your filtered water is both high quality and safe.WaterDrop RO Black
  • Also certified for reducing the odor and taste of chlorine.
  • Unlike some of the other cheaper filters, this filter actually reduces scale buildup.
  • The Watts 5YR improves the taste and clarity of your drinking water.
  • The unit comes with a special filtration media that extends filtration life by using bacteriostatic properties.
  • Easy to install and maintain.
  • The filter comes with all the  connection adapters and equipment that you will need.
  • This is by far one of the best selling filters of its category and has lots of good reviews.
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Culligan IC-EZ-1 EZ-Change Icemaker and Refrigerator Drinking Water Filter

Culligan IC-EZ-1 EZ-Change icemaker filter is one of the best refrigerator water dispensers and ice makers available today. This inline water purifier is designed to be connected to both the water and ice supplies.

  • The IC-EZ-1 filter removes bad odor and taste from water, while also reducing chlorine taste at the same time.
  • It also prevents other particles from getting into the water in your refrigerator.
  • This Culligan inline water filter is easy to install because it easily fits into the drinking water compartment of your refrigerator’s system.
  • This inline fridge has quick-connect fittings that make it both easy to install and stay in place until it needs replacing.
  • The filter last for up to 3,000 gallons of water.
  • This lightweight filter comes with a twist-off and twist-on mechanism, which makes replacing the filters both easy and fast.
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GE GXRLQ SmartWater Inline Water System

The General Electric (also known as GE) GXRLQ filter is particularly ideal for you if you have a GE refrigerator because of compatibility. GE fridges are set up with the space to easily install the GXRLQ behind the device. 

  • Using this filter will remove odor and improve the taste of your water.
  • It also filters the water that goes to the ice compartment of your fridge.
  • The GE filter has a relatively lightweight and compact design. This means that it can fit in tighter spaces.
  • Easy to install without getting an expensive plumber.
  • Each GXRLQ will come with a manual and installation guide, if it doesn’t there should be many videos on YouTube showing you how to install. The unit will come with everything you need to set up the filter.
  • Filter replacement is super easy with a twist and lock mechanism. Replacing the filter simply means unscrewing the old filter and and screwing in the new one.
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Filtrete Under Sink Advanced Water Filtration System

Filtrete under sink advanced filter is designed as an easy fit solution that allows you to enjoy clean drinking filtered water straight from the faucet.

  • It filters out and reduces the taste of chlorine, sediments and other odors.
  • The Filtrete filter features a filter media that is “electrostatically” charged, which acts like tiny magnets. The result is it both captures and attracts microscopic particles when they pass through the filter.
  • DIY friendly and easy to install. All you need is a screwdriver and an adjustable wrench. You will not need to install an extra filter, just install it directly to your current tap  faucet.
  • Remember that it should be connected to your cold water supply.

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So, Which Is My Favourite System?

Mr Water Geek ThinkingInline water filters are the most cost effective ways to get filtered water. The Aquasana Reverse Osmosis, filters 95% of fluoride & mercury, 97% of chlorine & arsenic and 99% of lead and asbestos.

It provides you with 13.32 gallons of water and this represents enough water for the average 1-3 person household. Hence this is enough water (drinking water from a kitchen faucet not including bathroom and laundry) for the average home. mrwatergeek winner badge

That means you get high quality filtered water for less than $30/year. I can’t think of too many other ways to get filtered water so cheaply.

Of all the inline water filters reviewed, my favourite is: The Filtrete under sink advanced water filtration system. OptimH2O Reverse Osmosis Under Sink Filters

Green Plus ArrowIt has a slightly higher upfront cost but filters up to 13.32 gallons a day. This means it is cheaper in the long run because you will only need to get a new filter once every 1-2 years (depending on your usage)

Green Plus ArrowAdvanced filtration when compared to the others.

Green Plus ArrowFinally, the starter pack gets you filter plus all the equipment you need to install.See Customer Reviews Button

Green Plus Arrow2 year warranty.

Green Plus Arrow90 day guarantee.

How To Change Inline Water Filter

Aquasana Undersink Reverse Osmosis SystemWaterDrop Reverse Osmosis WD-G2 SeriesWaterDrop Reverse Osmosis WD-G3-W
OptimH2O Reverse Osmosis Under Sink FiltersWaterDrop RO BlackWaterDrop RO White
- Effectively remove fluoride plus 87 additional contaminants.
- Multi-stage filter INCLUDES ReverseOsmosis + ActivatedCarbon + CatalyticCarbon + IonExchange + Remineralization.
- Filters 5x more contaminants than other RO systems.
- Removes 97% of chlorine and arsenic.
- 99% of lead and asbestos.
- 2 year warranty.
- 90 day guarantee.
- Compact space saving simple tankless design.
- Fast water flow rate of 400 GPD, saving over 300% of water.
- Fills a cup of water in 12 seconds.
- Bacteria and viruses removal .
- Real tankless design.
- NSF 372 & 58 certified.
- DIY installation.
- Free of 400+ chemical substances e.g. BPA, benzene, formaldehyde, cadmium, lead, etc.
- 7 stage filtration.

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I'm a health author, science enthusiast and 100% certified geek. My passion is to help you take control of your health and well-being by understanding the true importance of good quality water and healthy hydration.

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