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Best under sink water filter

The Best Under Sink Water Filter

Our top pick

We recommend the Frizzlife SK99 3-Stage is the best Under sink water filter system based on its performance, its price, and how other customers review it.

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10 Best Under Sink Water Filters

#1 – Frizzlife SK99 3-Stage Under Sink Water Filter

The SK99 is yet another under sink water filter model from Frizzlife that stands out on our list when it comes to filtering contaminants in municipal water. It’s a quality unit offering superb functionality and filtration ability that guarantees great results.

Filtration Performance

The Frizzlife SK99 is equipped with 3 stages of filtration comprising of a sediment filter and two carbon filters that provide high precision filtration of harmful contaminants. 

Stage 1 of the system is a pleated PP sediment filter cartridge and it delivers much better performance than conventional filter cartridges in removing sediments and particles from the water.

It has multiple layers on its surface that facilitate greater surface area and with 5-10 filtration precision, it will eliminate tiny to large particles present in the water including sand, silt, dirt and rust thereby ensuring better protection for the later 2 stages.

Stage 2 is made up of a carbon filter cartridge which serves as the initial filtration stage for most of the chemical contaminants. With a 3 to 5-micron precision, this filter performs well to significantly reduce the amount of chlorine, chloramine and other chemicals in the water.

It also removes volatile organic compounds (VOCs) as well as residual particles that may have made past the sediment filter.

At the final stage is the Frizzlife top-grade carbon block filter cartridge providing up to 0.5-micron filtration precision which is almost 10 times higher than many other brands as most of them with similar filters often have an average precision of 3 microns.

This remarkable contaminant removal performance allows the filter to clear out over 99.99% of lead, chlorine and the remaining VOCs and chloramine.

The filter will also remove fluoride, cysts and other heavy metals like arsenic, mercury, and cadmium thereby producing cleaner water with no unpleasant odor, taste or color.

Same to the Frizzlife MK99 model, the filtration process of this SK99 system does not touch the essential minerals. Calcium, potassium, magnesium, sodium, and phosphorus are some of the health-benefiting minerals it leaves behind which means the water that comes out is both clean and healthy with a fresh, natural taste.

#2 – CuZn UC-200 Under Counter Water Filter

The CuZn UC-200 is one of the best under sink water filters on the market. What makes it highly popular is its impressive filtration features, advanced design, quality, super efficiency, and convenience all at a relatively fair price. More importantly, it has the most long-lasting filter offering the highest capacity on our list.

Filtration Performance

The CuZn UC-200 model utilizes a 3-stage filtration process which consists of a micro sediment membrane, KDF-55 filtration media, and virgin acid washed catalytic carbon filtration media made from coconut shell carbon.

This impressive filtration process and advanced materials remove a wide range of contaminants from your water both inorganic and organic.

The first media which is the micro sediment membrane helps clear out sediments and tiny particles from the water.

The KDF-55 media and catalytic coconut shell carbon combination, on the other hand, work effectively to remove many different kinds of harmful chemical contaminants found in the water and the pipes.

The first main items they eliminate are chlorine, chloramines and chlorine byproducts like chloromethanes and bromoform. The robust catalytic coconut shell carbon filtration media is also capable of reducing most types of pharmaceutical and perfluorinated (PFOA) compounds.

It can reduce Glyphosate too and several volatile organic compounds found in municipal water.  In short, it will basically remove almost all chemical contaminants that often affect the taste, odor, and quality of water.

The UC-200 KDF-55 filtration media stage, in particular, does a great job of reducing up to 98% of all the water-soluble cation heavy metals like lead, chromium, nickel, mercury, cadmium and other dissolved metals.

Another commendable thing about this unit’s filtration process is that it purifies the water selectively. It will not remove the beneficial hardness minerals such as calcium and magnesium. Therefore, you get clean filtered water with the healthy minerals present.

#3 – Frizzlife MK99 1-Stage Under Sink Water Filter

The Frizzlife MK99 takes the second spot on our list and like CuZn UC-200 model above, this is an under sink water filter that has earned high ratings from many different users due to its fantastic performance and water flow production after installation.

Filtration Performance

The filtration system of the Frizzlife MK99 is a 2-stage process involving a sediment filter and an advanced carbon filter that work together to effectively eliminate contaminants in the water.

The 1st stage employs a pleated polypropylene (PP) sediment filter with 5-micron precision and it clears out particles and sediments such as silt, sand, rust, and scales from the water.

The filter is 100% constructed using polypropylene media hence it won’t degrade even when exposed to many different chemicals.

On top of that, it’s made up of multiple membrane layers that are thermally bonded together, and as such, it provides consistent pore sizes and a much better dirt-rejection capacity than other sediment filters.

The 2nd stage consists of a highly effective carbon block filter which does the heavy lifting removing more than 58 contaminants commonly found in unfiltered water.

This advanced carbon filtration media with 0.5-micron precision which is by far smaller than most other similar under sink filters can remove up to 99.99% of chlorine, lead, chloramines and other chemical contaminants. In the same process, unpleasant tastes and odors are also cleared out of the water.

Volatile organic compounds, carcinogens, chromium 6 and heavy metals like mercury are all removed by this filter too. If you are looking for a unit that’s good at clearing out heavy metals, then this will make an excellent choice.

A key feature we also liked about the MK99 is that it’s intentionally designed such that it leaves the essential minerals intact. Therefore, calcium, potassium, magnesium, and sodium which are all important building blocks for achieving a healthy body will remain in the water while it strips the other contaminants.

#4 – iSpring US31 3-Stage Under Sink Water Filter

Taking the 4th spot on our list is the iSpring US31 under sink water filtration system. iSpring is a famous company in the water filtration industry known for producing top-of-the-line water filtration systems particularly reverse osmosis systems and replacement parts.

The company now includes under sink water filters on their long list of products and the US31 is one of their best models that has made a significant mark on the market.

It has been built to the same level of quality we’ve seen in most of iSpring’s systems with an aim to provide a convenient and efficient way to facilitate the supply of clean, healthy water.

Filtration Performance

To start, the iSpring US31 filter system features a more standard design with 3 separate stages of filtration that work to remove a lot of harmful contaminants.

In the 1st stage, the water flows through a universal 10” polypropylene sediment filter where common sediments are cleared out down to 5 microns.

It removes sand, dust, rust, dirt and all tiny particles which not only improves the purity of water but also helps protect and extend the life of the system itself.

The 2nd stage contains 5-micron CTO carbon and GAC filter which is a combination that effectively removes chlorine, chloramine VOCs, and many more common chemicals that contaminate the water and cause colors, cloudiness, bad tastes, and odors. These two filters also help reduce the number of heavy metals like lead and arsenic present in the water.

From there, the water goes through another CTO carbon filter in the 3rd stage where the remaining chlorine, chloramine, VOCs and other chemicals, as well as heavy metals, are further extracted from the water thereby improving its taste, smell and clarity.

These three stages will remove all these contaminants without losing the minerals in the water as is the case with RO systems.

The filter is equally designed to control and discourage bacteria and parasites from developing in the water, thereby if bacterial contamination is of concern, then you are guaranteed that the filtered water produced at the faucet will be of great quality.

#5 – APEC Water CS-2500 Under Sink Water Filter

Our next under sink water filter is the APEC CS-2500 water filtration system. This is a strong but more basic under sink water filter from APEC Water built to provide dependable filtration at an affordable price. It’s a good starting point for those who are looking for a simple, budget under sink water filter for improving the quality of their city water.

Filtration Performance

The APEC CS-2500 filtration process relies purely on a single filter cartridge for the removal of several different kinds of contaminants commonly found in water supplied from municipal treatment plants.

It utilizes a carbon block filter which may seem like a standard carbon filter but it does offer a respectable contaminant rejection rate. This highly porous medium is able to eliminate up to 97% of chlorine, bad tastes, odors and various other chemicals such as herbicides and pesticides from the water.

The media is also capable of removing 90% of all lead plus other heavy metals while ensuring that essential minerals like calcium and potassium remain in the water. It’s a much ideal filter for dealing with lead or anything chemical that contaminates your water.

Besides that, it’s designed to be bacteriostatic and as such, it will as well remove heterotrophic bacteria and inhibit them from growing or reproducing within the unit which is a big plus in preventing any possibility of further contamination happening inside the filter.

#6 – Aquasana AQ-5300 Under Sink Water Filter

The Aquasana AQ-5300+ also known as 5300 Max Flow is much similar to the Aquasana AQ-5300 model but with a slightly larger capacity and faster flow rate.

However, the two models feature 3 filtration stages rather than the 2-stage process of the AQ-5200 model. In other words, the AQ-5300+ is a robust and super effective system as you are going to see below.

Filtration Performance

Like the AQ-5200 above, the Aquasana AQ-5300+ model utilizes Claryum filtration technology but with an additional stage to make it a 3-stage filtration system.

Stage 1 of the system is fitted with a 20-micron sediment pre-filter which traps silt, dirt, rust and other visible sediments to prevent the following stages from clogging too quickly.

It’s a feature that often misses in most under sink water filters yet it’s really essential particularly in areas where the sediment and silt levels in the water are higher than normal.

Stage 2 and 3 consist of Aquasana’s Claryum filtration technology which is made up of activated carbon filter, catalytic carbon filter, ion exchange, and sub-micron filter.

At first, the water flows through the granular activated carbon filter where a significant amount of both organic and inorganic chemical contaminants that include chlorine herbicides, pesticides, pharmaceuticals and VOCs are removed from it along with unpleasant tastes and odor caused by these chemicals.

From there, the water goes through the catalytic carbon filtration media which is a more powerful carbon filter that clears out 99% of the chlorine and remaining chemical contaminants in the water. It also totally reduces chloramine present in the water, something that most under sink water filters cannot.

After that, the water passes through an Ion exchange filter which features a series of resin beads with large surface area and they work effectively to extract heavy metals like mercury and lead plus other micropollutants that the carbon filters fail to catch.

At the last stage of the filtration process which is the 3rd stage, we have the sub-micron filter which clears out the remaining particles and contaminants from the water down to 0.35 microns. It will capture asbestos, chlorine-resistant cysts like cryptosporidium and giardia, and any other impurities that the earlier two stages couldn’t remove.

These three stages together will eliminate up to 99% of 77 different kinds of contaminants but leave behind healthy minerals to give you a clean, fresh and natural-tasting water.

They will also not remove other total dissolved solids (TDS) and the only microbes they can remove are cysts hence it’s not that effective for bacterial removal which simply means you should only use the unit to filter treated water that’s microbiologically safe. It’s certainly not recommended for use with well water which doesn’t contain chlorine for disinfection.

#7 – Culligan US-EZ-4 EZ-Change Undersink Water Filter

The US-EZ-4 is one of the three models in Culligan’s US-EZ series with the others being the US-EZ-1 and US-EZ-3. Among the three, the Culligan US-EZ-4 stands out the most due to its high filtration performance. This and several other nice features you are going to see are what earns it a spot on our list of the best under sink water filters.

Filtration Performance

Although it’s just a single-stage filter system, this Culligan US-EZ-4 model is equipped with a super-effective filter cartridge which is more than capable of getting rid of most of the common contaminants and impurities found in water. It offers almost the same level of filtration ability as any other top 2-stage or 3-stage under sink water filter system.

The unit utilizes a 0.5-micron high-tech carbon block filter media which has been tested by NSF International and certified to NSF/ANSI standard 42 as well as standard 53.

These certifications first mean a significant reduction of chlorine from the water. It will clear out up to 97% of chlorine along with bad tastes, odor, and turbidity, and as well remove nominal particulate class 1 which includes all particles that are as small as 0.5 microns.

Unlike the US-EZ-3 and US-EZ-1, the US-EZ-4 will also eliminate chloramines from your water which is really commendable for a one-stage unit.

Most under sink water filter systems have standard carbon filters that only filter out chlorine but will not remove the very persistent chloramine disinfectant used by municipal water treatment plants.

Besides that, this filter will remove other harmful chemical contaminants like MTBE, dozens of VOCs and perfluorinated chemicals such as PFOA and PFOS.

The US-EZ-4 can as well remove cysts like giardia and cryptosporidium plus lead, mercury, and several other heavy metals. On average, it will reduce up to 99% of lead in the water.

As you can see, while it’s not a 3-stage system, it’s still a highly effective filter that can address many common contamination issues found in municipal water supplies.

Furthermore, it does leave behind some of the healthy, natural minerals in the water hence the water delivered to the faucet is clean and has good taste.

#8 – APEC Water WFS-1000 Under-Sink Water Filter

APEC Water is a reputable manufacturer of water filtration systems with a long history of producing quality products. Their WFS-1000 under sink water filter system does not disappoint either as it’s amongst their top products with much positive reception. 

It’s a basic under sink water filter designed purposely for removing chemical contaminants from the water, especially chlorine. If your water is already good but you just want to refine it and protect yourself against any potential contamination, then this is a nice option to check out.

Filtration Performance

The APEC Water WFS-1000 has 3 filtration stages consisting of a sediment filter and two carbon block filters which together provide a commendable filtration performance.

At the 1st stage is the high-grade 10″ polypropylene sediment filter which extracts as many sediments as possible from the water including dust, rust, silt, and other tiny and major particles in order to protect and maintain the filtering ability of the next stages.

The water then goes through an extruded carbon block filter in the 2nd stage which is typically made up of activated carbon particles fused together into a single block.

This serves as the first point of carbon filtration where a majority of the chlorine, VOCs and other chemical contaminants like pharmaceuticals, pesticides, and herbicides are initially removed from the water. Unwanted tastes, odors, cloudiness and residual sediments are cleared out as well at this stage.

The 3rd stage has the same extruded carbon filter which performs the final refining by further removing the remaining chlorine, odor, tastes, color, cloudiness and other chemicals.

The use of these dual carbon filters significantly boosts the filtration performance of the unit allowing it to get rid of almost all the chlorine, tastes and VOCs from the water, and also organic chemicals.

The mineral composition and alkalinity of the water do not change throughout the filtration process. The result is mineral-rich water that’s clean, looks clear and tastes fresh.

#9 – Aquasana 2-Stage Under Sink Water Filter

Aquasana is another reputable brand that continues to enjoy a lot of popularity in the water filtration business and they are well known for their eco-friendly filtering options.

The Aquasana AQ-5200 is amongst the top performing under sink water filter systems on the market and the main reason behind this is the fact it’s one of the few models that have the most contaminant certifications. Here is an outlook of its major highlights and setbacks.

Filtration Performance

The AQ-5200 utilizes Aquasana’s panted and NSF certified Claryum filtration technology which is a 2-stage high-performance filtration process designed to remove over 60 common water contaminants.

In fact, it’s only a tiny handful of filters on the market that use this filtration technology which consists of activated carbon media, a catalytic carbon filter media, and ion exchange.

The activated carbon filtration adsorbs organic chemicals in the water such as VOCs, MTB, herbicides, and pesticides as well as pharmaceuticals like ibuprofen and estrone.

From there, the water goes through a catalytic carbon filter where it isolates and eliminates chlorine and chloramines thereby improving the taste and color of the water.

The next filtration phase involves an Ion exchange which takes care of the heavy metals like mercury, lead, and arsenic. The system is also equipped with absolute sub-micron mechanical filtration (ASMF) which helps capture asbestos plus chlorine-resistant cysts such as giardia and cryptosporidium.

The use of these different filtration technologies significantly enhances the unit’s performance compared to its competitors allowing it to remove over 97% of the contaminants in the water.

In addition to this, the AQ-5200 is certified as well to remove PFPA and PFOS, and the filtration process itself is selective hence retains the naturally beneficial minerals resulting in filtered water that’s cleaner, healthy and tastes great.

#10 – InSinkErator F-2000S Under Sink Water Filter

Up next we have the InSinkErator F-2000S water filtration system. This is a simple under sink water filter that offers a reasonably rigorous filtration process at a fairly low price tag and maintenance cost.

Filtration Performance

The filtration process of the InSinkErator F-2000S comprises only one stage which features an efficient filter cartridge that’s certified to both NSF standard 42 and 53.

The filter contains a carbon block media and an ion exchange resin which together do so quite well to eliminate a substantial amount of contaminants.

The carbon block filtration media, in particular, reduces up to 97.5% of chlorine taste and odor in the water. It will also remove 99% of the normal particulates class 1 and cysts as well as turbidity.

The ion exchange resin in the filter takes care of heavy metals like lead and mercury. It’s capable of removing up to 99% of lead including other potentially harmful contaminants like asbestos, atrazine, benzene, Lindane, 2,4-D, carbon furan, and p-Dichlorobenzene.

To put it simply, this is a filter that will work best with treated water that’s not high on contaminants like fluoride and microorganisms. It’s ideal for light filtration purposes geared towards improving the quality of water rather than doing thorough filtration.

Conclusion

An under sink water filter provides a convenient and much affordable way of getting an instant supply of clean and healthy water. They are best for purifying municipal water with fairly low levels of contamination which doesn’t require an RO system to remove.

Best under sink water filter

The above-mentioned models have impressive filtration performance and can address various kinds of common tap water issues. However, your choice will depend on the particular contaminants you want to remove from your water as well as the capacity.

You should go for a high capacity system that has a faster flow rate and long-lasting filter which is easy to replace. CuZn UC-200 and Woder WD-S-8K-DC models are some good examples.

All in all, whatever unit you pick, make sure to confirm that it’s certified and capable of removing the contaminants that are often present in your water, and requires minimal maintenance.

We’re certain that with our reviews above, you will find it easier to make an informed decision and pick the best model for your household.