Home Kitchen gadgets and appliances reviews Water Filters Best Under Sink Water Filters in 2023 (Top 5) – Reviews & Buying Guide

Best Under Sink Water Filters in 2023 (Top 5) – Reviews & Buying Guide

Last Updated: Best Under Sink Water Filters of 2023 Reviews

Drinking filtered water is one of the most important parts of ensuring that you live a healthy life. Unfortunately, finding the right device for the job can be a challenging task.

This guide will help you find and choose the absolute best under sink filter for your home and needs. Of course, we think these ones are awesome for a load of reasons, but most importantly: they don’t take up any counter space. This guide will go into more of those reasons. We’ll also review our favorite under sink water filters of 2023.

Our Quick Under Sink Water Filter Rating Chart

Product name Stages Filter Life Rating
APEC Ultimate RO-PH90
GreatLivings Editor Choice of 2020
6 10,000 gallons
5 out of 5 stars
Check price
APEC Essence ROES-50
Reverse Osmosis System
4.7 out of 5 stars
Check price
iSpring CU-A4
4 Stage Option
4 1,100 gallons
4.6 out of 5 stars
Check price
3 Stage Option
4.5 out of 5 stars
Check price
Culligan US-EZ
Budget Selection
1 3,000 gallons
4.3 out of 5 stars
Check price

Under Sink Water Filter Reviews

Here is our top picks for under sink water filter and top rated under sink filtration system.

APEC Ultimate RO-PH90 – Best Under Sink Water Filter 2023

The APEC Ultimate RO-PH90 gives you everything you thought you needed in a water filter… and more. You get six different improvements with it, which makes some extremely clean outcome. That feature alone is worth the cost.

If that isn’t enough for you, then you’ll love that this system remineralizes your water with magnesium and calcium. You’ll never have to worry about brittle bones or magnesium deficiencies again!

As for the duration, that is 10,000 gallons. That gives you about a year between replacements – nice.

Finally, this system even adjusts the pH to give you alkaline water (pH 8 or 9). Alkaline one is preferred to the more acidic water that tends to come from the tap.

Of course, not everything is sunshine and rainbows. One major concern with all under sink filters is the difficulty of a DIY installation. Fortunately, APEC has a simple installation that does not require a plumber. However, having a plumber install it for you can save some problems, headaches, and money later on.

All in all, this is the greatest filtration device available to you, and it does not cost much for the amount of filtration you receive. For those of you looking for a good filtration to price ratio for your family filter, then this one should work out well for you. This device will also work for individuals, assuming you drink enough the recommended amount of water each day.


  • Reverse osmosis filtration is the most effective filtration method.
  • This unit also adjusts the pH level to 8 or 9, which is alkaline.
  • Adds calcium and magnesium to keep your bones healthy.
  • Made in the USA.


  • Most expensive unit, but still great value for all the features.
  • Reverse osmosis uses a lot of tap water in the filtration process.

Click to Check the Price

APEC Essence ROES-50 – Top Rated Under Sink Water Filter System

This unit is the best-selling water filtration device on Amazon, and it got there for a very good reason. This is one awesome reverse osmosis filter that will remove 99.999% of contaminants from your drinking water. And it still comes in at an extremely affordable price point. It even has a 2-year warranty just in case anything goes catastrophically wrong. Simply register for the warranty during your purchase, and you’re good to go.

The only notable difference between the ROES-50 and the APEC Ultimate RO-PH90 (listed above) is that this unit does not create alkaline water. This might become problematic if you have highly acidic water or you need alkaline one for medical reasons. Also, all APEC products are made in the USA, so you know their products will be of a high quality.

Overall, the APEC Essence ROES-50 works great for those that want a high-quality product while saving a small amount of money. It’s important to note, this is a reverse osmosis filtration system, so you will get extremely pure result at a great price point.


  • Reverse Osmosis removes basically everything.
  • Quick connect fittings will never leak.
  • 2 year extended warranty. Simply register when you make your purchase.
  • Easy to clean filters that last a long time.


  • Reverse osmosis filtration uses a bunch of water.

Click to Check the Price

4 Stage System: iSpring CU-A4

Do you want a filtration unit that does not waste any significant amount of water?

If that’s the case, then the iSpring CU-A4 is the system for you. First, this one uses four filters instead of the usual 5 or 6. Don’t let that fool you though. It can still filter tap water really well. And fewer barrierss means fewer ones to change, which makes maintenance costs much lower.

It also doesn’t require a big storage tank like a reverse osmosis system would require. This saves all that precious space underneath your sink. This means you have a place to store your cleaning chemicals, scrubbers, and whatever else we store underneath our sink.

I’m being serious. What do we store underneath the sink, other than a filter?

All things aside, this device works perfectly for the price and size. It also doesn’t require remineralization because the calcium and magnesium stay in place – perfect.


  • Removes lead, chlorine, mercury, and other gross chemicals.
  • Compact. It will even fit in an RV or boat.
  • Lifetime technical support. 1-year limited warranty.
  • Easy to install and replace the filters.


  • Does not remove total dissolved solids (TDS).

Click to Check the Price

3 Stage Filter: APEC WFS-1000

Does your municipality have clean tap water?

If that’s the case, then this model will work great for you. First things first, this device only has three stages that remove the taste and odor. This makes this the perfect choice if you live in an area, like Maine, with crystal clear water that might have the occasional funky taste. We don’t recommend this filter if you live in a place like Flint, Michigan or Florida.

Again, APEC makes all their products in the USA, so yes, the WFS-1000 is made in America. You also get a 1-year warranty and lifetime support. We find the lifetime support feature especially pleasing.


  • Very affordable.
  • Excellent support. Decent 1-year warranty.
  • American assembled.
  • Gives your water a good taste and smell.


  • Not going to remove many contaminants.

Click to Check the Price

Budget Filtration System Selection: Culligan US-EZ

Finally, the long-awaited budget selection goes to the Culligan US-EZ, which is actually very similar to the APEC device listed above that only removes taste and smell. As you probably guessed, this system only removes taste and smell, which is fine at this price point.

More importantly, it doesn’t take up much space due to it’s compact size. The duration is decent, but not great, at 3,000 gallons. This will last your six months to a year, it just depends on how much water you use per day. Some households drink a lot each day.


  • Inexpensive
  • Gives water a good taste and smell.
  • Small, compact, and light.


  • Removes very few contaminants.

Click to Check the Price

Pros and Cons of an Under Sink Filter

Best undercounter (under cabinet) water filter features

Most people know nothing, or next to nothing, about under sink filters, which is why this section will cover all the pros and cons of owning one in a simple to understand bullet-point format.


  • Eco-friendly – You will never need to purchase another plastic water bottle once you have a filter. The devices are also significantly cheaper in the long term.
  • Out of Sight – A filtration system may not actually be compact. However, you will likely never notice it because it’s hidden underneath your sink. We count that as a massive, massive benefit.
  • Maintenance – Replacing the filters is the only maintenance that you really have to do on a water filtration system. The good news? Replacing it is a relatively simple task that takes minutes.
  • Better taste – Filtering removes contaminants, which will greatly improve the taste. You are also more likely to drink great tasting water, so it will make you more healthy in an indirect way.
  • Affordable – Some options, such as whole house systems, cost quite a bit of money. Fortunately, under sink filters tend to be on the more affordable side of the market.


We won’t paint a rosy picture about under sink systems to convince you to buy one – they do have some cons! Keep in mind, every type of filter has its own set of cons. Personally, we find that an under-sink one has a relatively small amount of cons. However, you should know about them BEFORE making your purchase to make the most informed decision you possibly can.

  • Single tap – Under sink systems only have one tap, which many people (me included) find extremely annoying. One tap means only one location, which just happens to be somewhere near your sink. Fortunately, most households have only one place that you would want a tap, so it’s not that big of a deal.
  • Not in-line – Ok, another annoying feature is that it does not filter the water line. Instead, it diverts the water to a separate line with a separate tap, which means you have to drill a hole in your sink to install it. This can make the installation difficult. Installation may even be impossible on certain sinks.
  • Annoying to replace – Filter replacements are annoying for one reason: you have to go underneath the sink. Fortunately, they aren’t that difficult. More importantly, you don’t need to replace it frequently (one or two times a year), so we find this problem relatively benign and insignificant.

Under Sink Water Filtration System Buying Guide

These devices go underneath your sink, as the name implies, and have a tap that comes up through your sink. Most people use these to filter water for drinking and cooking, but you could also use it to give your baby a bath, I suppose.

One thing to mention, those of you with a house water filter will find an under sink system redundant unless it’s a reverse osmosis filter.

Things to Consider Before Purchasing

These systems are simple to understand. However, you should consider a few things before purchasing one. Here are the considerations you should take into account:

What is Your Reason?

The most important question to ask is, “why do you want a filter?”

If your water tastes bad, then a budget option would solve your problem and cost significantly less money in operation, maintenance, and upfront costs.

Reverse osmosis works best if you want to remove everything bad from your water. A reverse osmosis system uses a lot of it in the filtration process, so keep that in mind before purchasing one.


The life of your filter is another thing to consider before purchasing one, and it’s especially important with an under sink system since you have to crawl around on your back to replace the filter. This process can be easy with some of the products listed, but not all of them. It also varies depending on the layout of your sink. However, it does take time and it’s always a little bit annoying. Just how it goes sometimes.

The Number of Stages

Filter stages determine how many total dissolved solids (TDS) are removed. More stages means less TDS, which is a good thing. However, more stages will cost more during filter changes and it will take longer to change them out all.

Size of the System

Another important consideration is the size. More stages means more size. And that’s something that just might not work in all households or apartments. Naturally, a reverse osmosis system will be the largest system listed because it has a storage tank for waste water and filtered one.

Final Thoughts

All in all, you simply can’t go wrong with an under sink filter. The extra faucet serves as a great reminder to drink more water – you can’t drink too much of it. Such filter saves counter space and fridge space, too. This makes it a great option for those that live in a small home or apartment. Or those of you that have a small refrigerator.

One more thing, you can even have the absolute best water filtration system on the planet, reverse osmosis, directly underneath your sink delivering you fresh and clean water whenever you want it. If you just want good tasting one without all the hassle of reverse osmosis, then we also covered plenty of affordable options in the above list.

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