I Tested And Reviewed 10 Best Under Sink Water Filter For Well Water (2023)

I am extremely impressed with this product. Initially, I had some doubts about installing it as I live in a rented apartment and was unsure if the leasing manager would allow it. Additionally, I was concerned about my own ability to install it without the proper tools and skills.

Fortunately, the leasing office approved the installation within a day or two. Although the installation process seemed straightforward, I took the time to read the manual and familiarize myself with the steps. Surprisingly, I was able to install it in just around 30 minutes. The only minor hiccup I encountered was when attaching the blue rings that regulate the pressure. I had to use a screwdriver along with the provided wrench to ensure a proper connection, as I initially experienced a small water leak. However, with a bit of adjustment, I managed to fit everything correctly.

One of the great features of this product is its design. I have currently placed it in a standing position without screwing it to the cabinet wall. Surprisingly, I did not experience any water leakage, so I decided not to use the white tape that came with the filter. It seems to work perfectly fine without it.

I would advise future users to be cautious and gentle when handling the plastic threads. Applying too much force can result in cutting the thread, which would require the use of the white tape. However, it's important to note that you don't necessarily need a plumber to install this product. With careful handling, it can be easily done on your own.

After completing the installation, I monitored the system for 10 minutes to ensure there was no water leakage. Once I was confident in its performance, I tried the filtered water and was pleasantly surprised by its taste and cleanliness. The water was significantly better than what I had been drinking before, which sometimes had a slight yellowish tinge. Unfortunately, I forgot to take a picture of the water before installing the filter.

It has only been a week since I installed this product, but the results have been excellent so far. I am particularly interested in the longevity of the filter and how long it will last. If any issues arise, I will provide an updated review.

I recently purchased the iSpring US15 under sink water filtration system and I must say, I am extremely pleased with my purchase. The product arrived in excellent packaging and included clear and easy-to-follow instructions, making assembly a breeze. One of the reasons I chose this particular system over others on the market is because it does not require drilling a hole, which can be a hassle.

The capacity of the iSpring US15 is also impressive, ensuring that it will last me a good while before needing to be replaced. In the past, my family and I used to boil water and wait for it to cool before being able to drink it, but now, thanks to this filtration system, we can enjoy clean and refreshing water directly from the sink. Cheers to cold water!

What sets the iSpring US15 apart from other water filtration systems I have tried is its exceptional performance. I had previously used a Brita water filter container but grew tired of the constant refilling and cleaning required to prevent mold from forming. With the iSpring US15, I no longer have to worry about these issues. The taste of my tap water has been completely transformed, and it now rivals the taste of premium bottled water brands such as Fiji and Smartwater. I can't believe I waited so long to invest in a system like this.

The convenience of the iSpring US15 is unmatched. I no longer have to rely on water coolers, pitcher filters, faucet-mounted filters, or bottled and boiled water. This system provides me with great-tasting, odorless water that is on par with the previously mentioned methods. Not only does it save me money by eliminating the need to purchase water, but it also saves me time and effort. The installation process was a breeze, even for someone like myself with arthritis and other ailments. It took me less time to install the system than it did to clear out the space under my sink. The sleek black design is a nice touch as well.

I am also impressed with the customer support provided by iSpring. The product manual was helpful, but I also found their YouTube video to be a valuable resource. The fact that other customers have praised the company's customer service team is what ultimately convinced me to give this system a try. I am glad I did because the chlorine reduction and improved taste of my water were noticeable from the very first day of installation.

The iSpring US15 is simple and compact in design, allowing for easy storage under my sink. It has also significantly improved the flow rate of water, which is another added bonus. Thanks to this system, I no longer miss bottled water and can confidently say that this is one of the best under sink water filtration systems I have ever tried.

I recently purchased the CU-A4 water filtration system for my home as a replacement for our previous RO system. While the RO system provided excellent tasting water, it took up a lot of space under the cabinet and required regular maintenance and sanitization. Additionally, it had intermittent leak problems. I was looking for a system that would not only provide cleaner water but also eliminate the clutter, maintenance, and leaks.

Here are the pros and cons of the CU-A4 system based on my experience:

CONS:

1. The instructions provided were not clear enough, especially when it came to making the water connections. It assumed a certain level of familiarity with these types of connections, which may not be the case for everyone. The section on installing the faucet was particularly confusing as it described a different faucet model. The faucet included with the system is an "air gap" style, which requires a specific hole size in the sink or counter. If your existing hole is not the right size, you may need to make adjustments.

2. The system came with three colors of tubing (red, white, and blue), but there was an insufficient amount of red tubing provided. I had to use the white tubing and label it as red to ensure a clean installation.

3. The manual did not mention the run-in time required after completing the installation. Initially, the water was barely drinkable, but after flushing the system with approximately 15 gallons of water, the taste improved significantly.

PROS:

1. Once you familiarize yourself with the system and have all the necessary components, the installation is relatively easy. The snap-fit connections work well and do not leak.

2. The system has twist-on replacement filters, making filter changes simple and straightforward.

3. It occupies minimal space under the cabinet, which is a definite advantage over larger systems.

4. The faucet is made of durable metal construction.

5. After the initial flushing and a week of use, the water tastes great. It is comparable to or even better than some bottled waters I have tested.

6. The customer service provided by iSpring has been responsive and helpful whenever I have reached out to them.

CONCLUSION:

NOTES:

1. It is important to note that this system does not reduce total dissolved solids (TDS). If you have a water softener system, it is advisable to consult your service company or conduct an internet search on how softeners and filters can work together before purchasing the CU-A4.

2. There have been reviews mentioning a 1/2" 3-way valve and the need for adapter fittings. However, my system came with a 3/8" to 3/8" 3-way valve, which worked perfectly. It seems that iSpring has made changes to the valve size.

3. Some reviewers have mentioned the lack of reduced TDS and incurred restocking fees when returning the system. It is important to note that iSpring does not claim reduced TDS for this particular system. If you require reduced TDS, they offer a highly rated RO system at an additional cost.

4. The instructions provided with the system are not the best. I recommend laying out all the components beforehand, familiarizing yourself with them, and identifying any potential compatibility issues with your existing plumbing. It may also be helpful to bring the 3-way valve to a local home improvement store to ensure you have any necessary adapter fittings.

5. Make sure you have the appropriate tools for the installation process.

6. To ensure a watertight connection, remove the blue "horseshoe" clips and firmly push the 1/4" tubing into the couplers until it "bottoms out." Test the assembly by pulling on the tubing and replace the blue clip.

7. I made all the tubing the same length and long enough to facilitate easy filter changes in the future. I coiled and taped the tubing for convenience.

8. I purchased an extra set of filters in advance and keep them next to the unit for easy access.

9. Instead of changing the filters based on a calendar schedule, I plan to change them based on usage. As we only use the system for drinking and cooking, we will likely never reach the recommended average of 3 gallons per day. Most filter manufacturers suggest replacing filters every 6 months, which is roughly equivalent to 1200 gallons. I will change my filters after approximately 1 year, which is around 90% of the recommended filter life based on our usage. Adjust your schedule accordingly based on this formula.

I have been installing drinking water filters in every house I have lived in for many years, whether it be a country cottage or a city condo. Recently, I came across the APEC WFS-1000 and I must say, it is by far the best filter system I have ever used.

One of the standout features of the APEC WFS-1000 is its size. It is the same size as a whole house filter but is designed specifically for undersink use. This means that it can provide the same level of quality and filtration as a larger system, but without taking up too much space. As someone who lives in a smaller condo, this was a game-changer for me.

Installation of the APEC WFS-1000 was a breeze. The high-quality parts and quick connect style fittings made it easy to set up. I didn't have to worry about searching for special connectors or tubing sizes, as everything was industry standard. It's great to know that APEC uses American parts and provides heavy-duty, reliable components.

The water flow from the APEC WFS-1000 is impressive, far better than the 2 stage filter I had previously. But what really sets this system apart is the taste of the water. It is as good as it gets. The overkill in filtering capacity ensures superior water quality, comparable to a reverse osmosis system, but without the wastage of water.

One small improvement I would suggest is the inclusion of a clear canister for the first stage grit filter. This would make it much more convenient for filter experts like myself to monitor the condition of the filters and determine when they need to be replaced. Water supplies can vary, and this visual monitoring would provide a more accurate replacement schedule.

In terms of price, the APEC WFS-1000 is definitely worth it. Considering the quality, durability, and performance of the system, it is a great investment. Especially for those like me who have well water with an unpleasant taste, the APEC WFS-1000 will make a significant difference.

I am extremely satisfied with my purchase of the Waterdrop under sink water filter. As the manufacturer of my previous fridge no longer produces water filters, I needed to find a new solution for clean water. The taste of our local tap water was unpleasant, and I wanted to avoid buying bottled water. The filtered water from this system has an excellent flow rate and a neutral taste, exactly how water should be. Although I didn't test the water for particulates before and after installation, I am confident that the filtration process is effective.

In terms of installation, I would consider myself to have intermediate plumbing skills. It took me approximately 90 minutes to install the filter, with most of that time spent maneuvering under the sink. The most challenging part was removing our old soap dispenser to utilize the existing hole in the counter. Thankfully, everything needed for installation was included in the package, including plumbing tape. The filter even came with a cold water adapter, eliminating the need for any additional purchases. To ensure stability and prevent any damage, I opted not to mount the filter with screws due to nearby electrical outlets and the dishwasher. Instead, I used command strips and tacky materials to support the weight of the filter.

The only drawback I encountered with this water filter system was the lack of instructions in the box. However, I was able to find a helpful installation video on YouTube titled "Waterdrop under sink filter installation." This video guided me through the entire process, ensuring a successful installation. If any changes occur in the future, I will update my review. But for now, I am truly impressed and satisfied with this product.

The seller has also addressed a previous issue of slow water flow by updating the product. The new version now provides a faster water flow, allowing for quick and convenient installation. I appreciate the seller's assistance in resolving this problem and ensuring a positive experience.

Initially, I didn't think our tap water tasted too bad. However, after installing the Waterdrop 17, I am pleasantly surprised. The filter has made a significant difference in the taste of our water, eliminating any unpleasant flavors. This is particularly impressive as the filter is designed to last for three years, making it a cost-effective alternative to purchasing bottled water.

The installation process was straightforward. I simply disconnected the cold water line and connected the included hoses in line with the filter. Although I didn't require the adapters, it was thoughtful of Waterdrop to include them. The only minor drawback I noticed is a slight decrease in water pressure when using the filter. While it is not a significant issue for me, as I primarily use cold water for filling the coffee maker or drinking, it is worth noting. It is important to mention this as the advertisement claims no drop in water pressure. However, this does not affect the hot water supply, which remains unaffected by the filter.

I recently purchased this product and overall, it is a quality product that works great. I would give it a five-star rating for its performance. However, I did encounter some difficulties during the installation process. The water lines behind my deep sink were not shortened by the previous installer, making it challenging for me to access and cut the lines or use a Pex tool or collars. As a result, it took me three and a half hours to install the filter, water line T, and the two lines to the filter. If the initial installation had been done correctly, it would have taken me only half an hour.

Despite the installation challenges, the product itself was easy to install. It comes with a "T" adapter already included, which made the process quick and efficient, taking only 15 minutes. The faucet that came with the filter is perfect, and the difference in water quality is amazing. The filters are also simple to replace, with each one lasting up to 2 years. This is a significant improvement compared to the previous faucet-end filter we had. Flushing the water for 5 minutes initially ensures perfect water with the necessary minerals for the body. Moreover, the product is affordable, making it even more appealing.

Once installed, I rarely think about the filter, which is a positive aspect. In fact, my husband recently asked how long we've had it and if we need to change the filter. After checking, I realized it has been 2 years and 4 months since installation. Despite its age, the water still tastes great, and the flow is fine. We are a family of six, and we use it constantly without any complaints. I am planning to replace the filter soon, just because it has been over 2 years. I vaguely remember any stress during the installation process, so it must have been relatively easy.

Living in my current residence for 16 years, I have never been able to drink the water due to the strong chlorine smell. Given the rising cost of bottled water and my aversion to procrastination, I decided to have this filter installed. The results were impressive. Both the smell and taste of chlorine are completely gone. The installation process was super easy, adding to the overall positive experience.

I was initially drawn to this filter because of its affordability and capacity. With a price of just $25 and the ability to filter 5000 gallons of water, it seemed like a great deal. Since I primarily use hot water from a separate source, I knew I wouldn't be using the filter for that. By calculating my daily water usage for drinking and washing fruits and vegetables, I realized that it would take me a year to reach the 5000-gallon mark even with a generous estimate. This means that the $25 investment would last me a long time, making it a much cheaper option compared to other filters on the market.

One of the things I liked about this filter is that it can be easily hidden away under the sink. Unlike other filter options like pitchers that take up excess space, this one is out of sight and out of mind. Additionally, the filter's lifespan can be easily determined by monitoring the water flow. Once the flow starts to deteriorate, it's a sign that the filter needs to be replaced.

Installation was relatively straightforward, although I did encounter a small issue. The package comes with two tubes, and one of them was initially missing. However, once I found it, I realized that inserting the needle into the filter required some finesse. To remove the needle, I had to hold down the sleeve towards the filter and then slide it out. The instructions could have been clearer on this point, as they mention pressing the sleeve together but fail to specify the importance of holding it down. As a result, I had to use pliers to hold the sleeve down and exert a significant amount of force to remove the needle. Thankfully, I didn't damage the sleeve, and once I turned on the water, everything worked fine. I let the water run for a few minutes to clear any initial sediment, and after that, the filtered water was noticeably clear and had a better taste and odor compared to unfiltered tap water.

I recently purchased the CuZn water filter based on the good reviews and the recommendation of my husband, who is a self contractor. Initially, the filter worked great for about 5 months. However, one day when I was out, a hose suddenly came off and caused water leakage. Unfortunately, by the time I returned home, significant damage had already been done to not only my kitchen but also the units below mine. I reached out to customer service for assistance but received no response.

Due to the extensive damage caused by the filter, I had to contact my insurance company to cover the expenses. The matter is currently under investigation, but it is shocking to think that such a small filter could result in such substantial damage. This experience has taught me the importance of investing in more expensive filters, as I now understand why they are available in the market. It's crucial not to risk losing your fortune due to a faulty water filter.

Update: I was pleasantly surprised when I was contacted by Chris from the customer service team. I must say that this company has the best customer service I have ever encountered. Chris was extremely responsive, considerate, and professional. He assured me that if the damage was indeed caused by their product, the company would take full responsibility. It's rare to come across a company that offers such a level of commitment to its customers.

While I may not entirely agree with their conclusion regarding the cause of the damage, I have been won over by the exceptional customer service provided. My plumber informed me that using a plastic hose, which can easily become loose due to water pressure in high-rise buildings, could have been a contributing factor. I have learned my lesson and will never use a plastic hose again. As long as I ensure the hose keeps the water stream smooth, I believe I can avoid a similar incident in the future.

I was also pleasantly surprised to discover that Amazon actively monitors customer reviews. Chris informed me that Amazon contacted them regarding my initial review. It's reassuring to know that customer feedback is taken seriously by both the company and the platform.

On a different note, I initially purchased my first CuZn water filter in 2018. The installation process was straightforward, and I was able to do it myself. As I did not have a dedicated water faucet for the filter, I connected it to my cold water supply. In March of 2022, I replaced the filter as the taste indicated it had reached the end of its lifespan.

Ten months after purchasing my second filter, I decided to connect it to a dedicated faucet to avoid wasting filtered water on cleaning and handwashing. I needed adapters to ensure everything fit together properly, so I reached out to CuZn via email to inquire about the necessary parts. To my surprise, I received a response on the same day, assuring me that the required parts would be sent out. Additionally, they acknowledged that I lived in an area with particularly hard water and included a pre-filter at no extra cost. The package arrived within two weeks, accompanied by detailed instructions.

I am genuinely impressed by the exceptional service provided by CuZn. As a woman in my 70s living on my own, I was able to assemble everything without any issues. I now have a dedicated faucet for drinking water with the added benefit of filtration. I am confident that this filter will last for another four years, and when the time comes, I will not hesitate to purchase my third CuZn water filter from them.

I recently installed this sink water filter in my home and I must say, it has made a significant difference in the quality of our water. We are on city water, which is a blend of well and river water, and often had issues with bad odor and taste. However, since using this filter, those problems have been completely eliminated.

The installation process was straightforward, even for someone like me who had never installed a sink water filter before. The included connectors were easy to install, although I did have to purchase plumber's tape separately. The filter itself is quite large, which initially intimidated me, but following the instructions carefully allowed me to successfully install it within a few minutes.

One of the features I particularly like about this filter is the see-through easy filter indicator. It allows me to easily monitor the condition of the filter and know when it needs to be replaced. Speaking of which, I did notice a discrepancy between the advertised lifespan of the filter (10k gallons) and the actual replacement recommendation on the filter (2k gallons). This is something to keep in mind when considering this product.

The taste of the filtered water is excellent, akin to drinking bottled water. It has also improved the water pressure in my kitchen, which is a bonus. However, I did encounter some difficulties with the installation due to the high water pressure coming out of the filter. As an amateur plumber, I struggled to find and hook up a compression valve adapter for the water supply tube. Twice, the compression valve failed, resulting in water leakage and a mess in my kitchen. This is partly due to my lack of expertise, but it's worth noting that this filter is more challenging to install compared to others that come with everything included, including the faucet.

Despite the installation challenges, I am very satisfied with the performance of this sink water filter. The taste and quality of the water have improved significantly, making it difficult for me to go back to drinking non-filtered water. If you have some plumbing experience, I believe you will appreciate this filter. However, if you're a beginner, be prepared for a more complex installation process.

I recently upgraded my previous review and am now giving the Waterdrop In-Line Water Filter a 5-star rating. After reaching out to the company, they clarified the issue regarding the NSF certifications. It turns out that the model numbers on the WQA website do not fully reflect the suite of offerings from Waterdrop. For example, the model "EWF-8016S" is equivalent to "WD-10UA," but only the former model number is listed on WQA, causing confusion. This means that the Waterdrop In-Line Water Filter is indeed NSF 42 and 372 certified, and any issue lies with WQA's lack of clarity with their certifications.

Now, let's dive into the details. The Waterdrop In-Line Water Filter claims to be NSF 42 and 372 certified, indicating its ability to filter out contaminants. However, initially, there was only evidence of the NSF 42 certification, leaving doubts about its effectiveness in removing components like lead (NSF 372). This led me to return the product, as I sought clarification from the company regarding the NSF 372 certification. Unfortunately, the link provided by the company did not list this filter as certified by WQA.

It's also worth mentioning that the TDS meter had no impact on the water filtered by this product. While this meter only measures one aspect of purity, it is an important factor to consider when evaluating the effectiveness of a water filter.

Regarding claims from other reviews stating that this filter works wonders, it's important to note that visual assessments based on gunk in the water may not provide a complete picture of the water's purity. Verifiable lab tests are crucial in identifying and confirming the presence of contaminants like lead, copper, and others. Therefore, claims of exceptionally clean water should be supported by reliable lab tests.

I have given this product a 2-star rating instead of 1 due to its easy installation process and well-done instruction manual. The installation was straightforward and hassle-free, allowing for a convenient setup.

I purchased the Waterdrop In-Line Water Filter as a replacement for a Brita filter pitcher that required significant time and effort to fill and use. With the pitcher, we had to wait for it to fill halfway before adding more water, making the process time-consuming. Additionally, we used the filtered water in a hot water dispenser, further increasing the time spent on water preparation. The purchase of the Waterdrop In-Line Water Filter, along with a dedicated water faucet dispenser, was a game-changer in terms of efficiency and convenience.

The Waterdrop In-Line Water Filter comes with two water line hoses for input and output, a 3/8" female end from the water valve to the filter (input), and a 3/8" male end from the water faucet to the filter (output). If you have standard plastic water faucet hoses, the installation and connection process is simple. However, if you opt for a Kraus water faucet like we did, the installation process becomes slightly more complex.

Despite the additional steps required for the Kraus water faucet installation, it was well worth it. The Kraus water faucet not only added a touch of quality and beauty to our kitchen but also provided a water flow as fast as our Moen water faucet. To connect the Kraus water faucet to the Waterdrop In-Line Water Filter, we used a 1/4" female to 1/2" male (compression) adapter and a 1/2" female to 3/8" female standard FIP faucet hose. The 3/8" female end of the faucet hose connects directly to the 3/8" male end of the filter's output hose. Additionally, depending on your setup, you may need a 3/8" compression "add-a-tee" for an extra line to the filter.

I have included pictures of the connections to provide a visual reference. The installation process, including the Kraus water faucet, took approximately an hour. The included hole template helped align and screw in the filter cap to the inner wall, allowing for easy access to replace the filter when needed. I installed the filter on the side for convenient filter replacement.

While the installation process may require some effort, the benefits of having clean drinking water quickly and easily outweigh the initial work. The Waterdrop In-Line Water Filter, when paired with a suitable water faucet, provides a reliable solution for accessing filtered water without the time-consuming processes associated with pitcher filters.