If you’re looking to buy an under the sink water filter, a quick internet search will turn up hundreds of other options. But how can you identify which under-sink water filter system is ideal for your home without wasting a lot of money and time trying them out? We’ve already gone to the trouble of reviewing and comparing all of the best and most popular ones for you. To save you time, we’ve compiled a list of everything we learned from the following ten reviews and chosen our top three to recommend.
Summary of The Best Under The Sink Water Filters for 2021
CuZn UC-200 Under Counter Water Filter
Easy to install
Watts Premier 2-Stage Under Sink Water Filter
Removes lead, cysts, VOCs, and chlorine
iSpring 6-Stage Under Sink Water Filter System
6 stages of filtration
Woder WD-S-8K-DC Under Sink Water Filter
Removes 99.99% of contaminants
Frizzlife MK99 Under Sink Water Filter System
Top 10 Best Under The Sink Water Filters
1. CuZn UC-200 Under Counter Water Filter
Look no further than the CuZn UC-200 Under Counter Water Filter for a full water filtration system that fits perfectly beneath your kitchen sink. This filter removes all undesired contaminants from your water while cleaning it without eliminating essential minerals for your health.
With a three-stage filtering process, this filter removes chlorine, heavy metals, sediment, algae, mold, pesticides, herbicides, bad tastes and odors, and more, leaving you with healthy, delicious, and clean drinking water. It is not, however, designed for filtration of private well water and should only be used with public water.
A single filter can last five years or 50,000 gallons of water, whichever comes first. Even better, this filter is easy to set up and only takes around five minutes. Everything you’ll need for a regular installation is included, and if you already have non-standard pipe, they’ll throw in a complimentary non-standard installation kit.
- Up to 5 years of use from a single filter
- Easy to install — no professionals needed
- 3-stage filtration purifies without removing healthy minerals
- Not for use with private well water
2. Watts Premier 2-Stage Under Sink Water Filter
VOCs are thought to be present in one-fifth of the country’s water supply (VOCs). The Watts Premier 2-Stage WP500313 Under Sink Water Filter, which filters these harmful substances completely, can protect you from them. But this filter system is capable of much more. Lead, herbicides, pesticides, chlorine, and a range of other pollutants are all removed through the filtration process. This is one of the few filters that can remove giardia, entamoeba, toxoplasma, and cryptosporidium bacteria and cysts. This means it can be used with water from a private well.
Given everything this filter removes from your water, it’s a lot less expensive than many other alternatives that don’t remove nearly as many harmful particles. It is, however, not without problems. Rather than filtering the water that goes to your current sink, this filter comes with its own tap that dispenses the filtered water while also taking up counter space. Every 600 gallons, you’ll also need to replace the filters. However, due of the peace of mind it provides at such a low price, we believe it is the best under sink water filter for the money.
- Affordably priced
- Removes lead, cysts, VOCs, and chlorine
- Also removes bacteria and cysts
- Uses its own tap instead of your existing faucet
- Only has a 600-gallon filter lifespan
3. iSpring 6-Stage Under Sink Water Filter System
If you want a premium drinking experience every time you reach for the tap and you are ready to pay a little extra for the highest-quality water, the iSpring 6-Stage RCC7AK Under Sink Water Filter System is our recommendation. This unique filter system uses six-stage reverse osmosis technology to thoroughly cleanse your drinking water. It has the ability to remove up to 99 percent of over 1,000 harmful contaminants. On the list are chlorine, fluoride, arsenic, asbestos, calcium, and other pollutants.
While most of the filters we looked at simply remove contaminants from your water, the iSpring filter goes a step further. The sixth stage of the filtration process is an alkaline remineralization filter. This method adds minerals back to your water, resulting in balanced alkalinity, improved taste, and vital minerals for your health.
This system has its own faucet that purifies the water from your main faucet instead of using the water from your main faucet. It is, however, designed to be installed by a homeowner without the help of a professional. Keep in mind that, especially with the 3.2-gallon pressurized tank, six stages of filtration might take up a lot of space under your sink.
- Removes up to 99% of over 1,000 contaminants
- 6 stages of filtration
- Adds healthy minerals back into your water
- Takes up a lot of space under your sink
- Uses a dedicated tap instead of your existing faucet
4. Woder WD-S-8K-DC Under Sink Water Filter
The Woder WD-S-8K-DC Under Sink Water Filter is an option worth considering if you’re low on space under your sink and want a small water filter that won’t take up much space. It simply has one single-stage filter and is small enough to fit in the corner of your cabinet. The best aspect is that it’s easy to put together and requires no plumbing.
This filter has a three-year lifespan or 8,480 gallons of water capacity. We haven’t seen the best filter life, but it’ll suffice. It claims to remove 99.9% of contaminants, which is fairly impressive. It is, however, only intended for use with municipal water, not well water. This is due to the fact that it will not eliminate germs or cysts, which are the main hazards. Heavy metals, lead, chlorine, VOCs, mercury, and other contaminants will be removed, but beneficial minerals will be left behind, making for a pleasant and refreshing drinking experience.
- Lasts for 3 years or 8,480 gallons
- Easy to install — no plumbing required
- Removes 99.99% of contaminants
- Not for use with well water
- Doesn’t remove bacteria or cysts
5. Frizzlife MK99
The Frizzlife Under Sink Water Filter System is a low-cost way to start drinking cleaner, healthier water right away. It has a two-stage filter with a filtration level of 0.5 microns. As a result, it is able to remove 99.99 percent of contaminants, which is a large claim. Lead, heavy metals, chlorine, volatile organic compounds (VOCs), carcinogens, disagreeable tastes and odors, and much more are all on that list. It does not, however, eradicate the harmful bacteria and cysts commonly found in well water.
This filter appeals to me because of how simple it is to set up. It is reported to take three minutes to complete and does not require any plumbing. Unfortunately, this was not the case for us. When we fitted it, the fittings leaked, so we had to reinstall it using a better thread sealer than the one that came with it. Even while the setup took a little longer than expected, it was still rather simple in the end.
According to the manufacturer’s instructions, this filter should be replaced every six to eight months. That means you’ll have to replace filters far more frequently than you would with some of the other systems we looked at, which had filters that lasted for years. Furthermore, altering the filter is difficult due to the way this system is set up; a minor issue, but nevertheless an annoyance.
- Affordably priced
- Removes 99.99% of contaminants
- Installs quickly with no plumbing required
- The filter should be replaced every 6-8 months
- The included fittings tend to leak
- The filter is difficult to replace because of how it’s installed
6. Ecosoft FMV3ECOUS
When it comes to filtration, more isn’t necessarily better, but it typically is. As a result, the Ecosoft FMV3ECOUS Under Sink Water Filter System has three filtration stages. As a result, it is able to remove particles, bacteria, and other contaminants. We were relieved to learn that, unlike many others, this technique kills bacteria. This filter also comes with a two-year warranty, which we didn’t notice with the majority of the other systems we looked at.
This one, on the other hand, was a pain to assemble and takes up a lot of space beneath the sink. This system is larger than single-stage systems since it has three stages of filtration. Worse, the fittings that were provided were not compatible with our plumbing system. They were 5/8” in diameter when they should have been 3/8” to work with standard plumbing. This meant that we had to spend a lot of time and money going to the hardware store, which increased the filter system’s overall cost. We like that this filter removes bacteria, but the extra bother and cost aren’t worth it to us.
- 3-stage filter system removes particles, bacteria, and more
- Includes a 2-year warranty
- Takes up quite a bit of under-sink space
- The included fittings don’t install on most plumbing
7. 3M Aqua-Pure 3MFF100
At first appearance, the 3M Aqua-Pure Under Sink Water Filter System appears to be an excellent choice. It contains a three-stage filter system that eliminates odors, tastes, lead, cysts, and even some VOCs such as benzene. However, it fails to remove hazardous germs and leftover VOCs, despite the fact that other, far less expensive filters we tested were able to do so. We believe the performance of this filter is subpar for the price.
This filter appealed to us because it connects to your main water line and filters water from your sink faucet, rather than a dedicated filtered water faucet. However, the installation fittings were not supplied. We were dissatisfied that, given the expensive cost of this filter, we had to make a second trip to the hardware store and spend much more money just to get it installed.
In and of itself, the installation was difficult. We had some prior plumbing experience and were able to perform the job successfully. If you have no past experience with plumbing, though, you may need to seek professional help.
The filter’s short lifespan was our final gripe. Each one only lasts a year, compared to our preferred filter’s five-year lifespan.
- Removes cysts and some VOCs
- Filters water to your main sink faucet
- 6,000-gallon or 12-month filter capacity
- More expensive than other systems
- Doesn’t include the fittings you need for installation
- More difficult to install than other filters
8. APEC WFS-1000
APEC Water Systems designed and built this three-stage filter system in the United States. It comes with a one-year satisfaction guarantee, which corresponds to the lifespan of the filters. A one-year filter life isn’t particularly noteworthy when compared to other filter systems with filter lifespans of up to five years.
This filtration system removes chlorine as well as unpleasant tastes and odors. However, it has no effect on total dissolved solids. It also won’t get rid of germs or cysts, therefore it’s not recommended for people who use well water. To be honest, the tiny number of contaminants that this filter does remove didn’t impress us, especially given the high price tag. For the same money, you can buy a filtration system that filters bacteria, cysts, VOCs, and other contaminants, as well as having a far longer filter life.
- Removes chemicals, tastes, and odors
- 3 stages of filtration
- Designed and built in the USA
- Doesn’t reduce total dissolved solids (TDS)
- Won’t remove bacteria or cysts
- More expensive than other options
- Filters only last for 1 year
9. Culligan US-600A Filtration System
We liked the Culligan US-600A Under-Sink Drinking Water Filtration System because of its low price. However, as we learned with this filter, cheap doesn’t always mean better. Even so, the bundled five-year guarantee is better than any other we’ve seen.
This system filters the water that comes out of your existing faucet. In general, we prefer this to a dedicated filtered water faucet. The flow rate of this filter, on the other hand, is relatively low, at only one gallon per minute. Our sink’s flow rate was lowered to the point where it was barely usable once it was installed.
The worst thing was getting this filter put in the first place! It will be difficult to connect the tubing to your existing plumbing because it is the wrong diameter. It will necessitate a number of excursions to the hardware shop as well as a number of additional fittings.
When it’s time to replace the filter, good luck getting the cartridge open! It’s always stuck shut, which is inconvenient considering how often you’ll be changing filters. Their lifespan is limited to 1,000 gallons. It’s not really impressive when compared to some of the other filters we looked at.
- 5-year warranty
- Filters water to the existing faucet
- Filter lasts just 1,000 gallons
- Slow flow rate
- Incorrect tubing supplied — makes installation difficult
- Hard to replace filters
10. Aquasana AQ-5300+.55
Our expectations were set high by the Aquasana AQ-5300+.55 water filter system. With a simple installation, everything got off to a good start. All of the components we needed were included in the box. We were, however, unsatisfied with the filtering system. It only removes 77 contaminants, whereas other systems we evaluated might remove hundreds, if not thousands. Furthermore, this filter has no effect on total dissolved solids. This isn’t a deal breaker, but it’s something to keep in mind.
The fact that each filter cartridge only lasts six months is another downside of this filter system. That’s little compared to the five years that the filters on some of our favorite systems lasted. Worse, it’s one of the priciest systems we’ve ever seen! We expected much more for the price, and we do not suggest the Aquasana system despite its ease of installation.
- Easy installation with all parts included
- Retains beneficial minerals
- Only removes 77 contaminants
- Overpriced and expensive
- Filters only last for 6 months
- Doesn’t reduce TDS
After weeks of testing and investigation, as well as hundreds of gallons of water, we landed on three recommended under sink water filters to recommend. Our favorite was the CuZn UC 200. Its three-stage filtration method eliminates pollutants while leaving essential minerals in place. Even better, it’s simple to set up and doesn’t necessitate the use of a professional. Finally, each filter may last up to five years or 50,000 gallons of water, making them the most long-lasting filters we looked at.
The Watts Premier WP500313 is a wonderful pick if you’re on a budget and want the best value. This filter is not only affordable, but it also performs admirably. It is leprosy-free.
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