4 best under sink water filter for well water

The fact that well water has some impurities does not mean that you have to live with that. With technology, filtering water is now easier than it has ever been. There are different water filtration systems in use including under sink systems. They will effectively filter out chlorine, fluoride, hard metals and any toxins.

There are many filters in the market and to get the most out of a filter, it is better to go for the best under sink water filter for well water.

Best under sink water filter for well water

In this buying guide, we are going to compare the 4 best under sink water filters that you can shop for right now. They are top-ranked and will make sure that you get value for money. Our top picks include:

This is a high-efficiency tankless water filtration system that is great for drinking water. The system comes with 2 CTO carbon block filters. The water first goes through sediment filtration before going through the dual carbon filtration. Apart from removing common water impurities such as dust and rust, the system also removes heavy metals and chemicals. It also removes any bacteria and odors.

The system has a fast flow rate to make sure that it efficiently meets the needs of your home. It is up to 20 times better as compared to the regular dispenser. It has good water pressure of up to 1GPM though that depends on the water source. Its maximum pressure is 90psi.

It has been made with a good design that is covered by an all-metal faucet and a clear transparent 1st stage housing for easy filter inspection.

The system complies with the FDA standards as well as the NSF/ANSI standards to make sure that you get high water quality.

The water filter system is easy to install and maintain. It is armored with a sediment filter system to make sure that your system can serve you for long. In addition to that, it comes with an extended manufacturer’s warranty.


  • Weight: 12.02 pounds
  • Product dimensions: 16 x 6 x 16 inches
  • Warranty: 1 year


  • Dual carbon system and sedimentation makes sure that you get the best water quality
  • Easy to install and maintain
  • It is durable. The sediment-water filter system extends its life
  • It has a great flow of water
  • Extended manufacturer’s warranty


  • It does not remove scale build-up
  • Some users had an issue with leaking

This is a high capacity under the sink water filter that works best with municipally treated water or water that has been previously disinfected. It is great for dealing with the common water contaminants such as lead, chlorine, Chromium 6, heavy metals, and any toxins and microbes. It is however not meant for well water.

It has a long life of a minimum of 3 years. Its life will, however, depend on what water you are treating. Well water will shorten its life as it is harder and more acidic comparatively.

It is easy to install and can be done by anyone. It comes with direct connect hoses that you can easily connect with your sinks. The direct connect hose easily fits with your valve and faucet system.

It is both NSF/ANSI certified and has been made with BPI free material that is free from lead.

It has a great flow rate of up to 2GPM at 65 psi, which is faster than many water filters.

The filter system has been made such that it can do selective filtration. That will make sure that all the dirt and harmful materials are filtered out while leaving in the essential minerals.


  • Weight: 3 pounds
  • Product dimensions: 3 x 3 x 15 inches
  • Temperature range: 43 – 100 F
  • Flow rate: 2GPM


  • Easy to install
  • Can do selective filtering leaving the essential minerals
  • Has a good flow rate of 2GPM
  • It has been made with a BPI free material
  • It has a long life with a minimum of 3 years


  • It does not work well with well water
  • Some users complained of reduced water flow after 18 months

This is great under counter water filter with a high capacity of up to 50 k. It comes with a 5-year pro-rated warranty that assures you of a durable quality filter. CuZn is a great brand as all its products come with a 90-day satisfaction guarantee.

This filter, however, is not a water softening system but only purifies the water. That makes it only suitable for previously treated water such as municipally treated water. It will not work well with hard water such as well water.

It is very easy to install as there is no third faucet that is required. All you need to do is to connect to your current kitchen faucet. It works well with all standards faucets.

With the system, filtration takes place in 3 stages which is through micro sediment membranes, KDF-55, and coconut shell carbon. Unlike other kinds of filters, it filters out contaminants but does not remove the essential minerals from the water making sure that you take clean and balanced drinking water.

If you want to do a TDS test or PPM, it will not work with the UC- 200 filters. You can only do test strips such as the chlorine test strips to test chlorine in the water. Otherwise, you will have to go for a CuZn’s reverse osmosis system if you are looking for a TDS removal.

As much as the UC-200 is a carbon filter, it is bacteriostatic and thus does not support mold or any bacteria growth.

The product has been NSF certified with an NSF standard of 42 and 61.

It has a great flow rate of 2gpm to make sure that you have convenience in your home.


  • Weight: 8 pounds
  • Product dimensions: 4.5 x 4.5 x 15 inches


  • Easy to install
  • It has an ultra-high capacity of 50k
  • It comes with a 5-year pro-rated warranty and a 90-day satisfaction guarantee
  • It has a 3-stage filtration process to make sure that you have clean water without removing essential minerals
  • It has a good flow rate of 2gpm
  • It is bacteriostatic


  • It can only work with previously treated water as it does not have the capacity of dealing with very hard water
  • Some users complained of the filter not filtering much
  • Some users complained of the taste of water not being enhanced

This is a direct connect under sink water filter That can remove up to 99% of major contaminants such as lead, chlorine, chromium 6, different toxins, bacteria, and hard metals.

The filter does the process in 2 stages which makes sure that all contaminants are removed while leaving in the essential minerals.

It is easy to install and can fit both ½” and 3/8″ connect hoses well. It comes with connecting fittings that you can do on your own, with no help from a plumber. Unlike other kinds of filters, the filter cap comes with a built-in shut off valve that will help you shut odd water whenever you don’t need water, or when you need to do a filter cartridge replacement.

The filter has a high flow rate of up to 2 GPM @ 40 psig which is decent for any household.

The filter system contains a core filter cartridge inside so that if there is any damage, that’s the only part that you have to replace instead of replacing the whole system.

The cartridge has a high capacity of up to 1600 gallons and can be used for up to 2 years. It is, however, recommenced that the filter is replaced every 6-8 months for full functionality.



  • Weight: 4.2 pounds
  • Dimensions: 13.9 x 5.6 x 5.4 inches
  • Flow rate: 2gpm


  • It is easy to install
  • Has a good flow rate of 2gpm
  • It will save you money as you only need to replace the core filter cartridge in case of any damage
  • It has a 2-stage filter that will filter out contaminants while leaving behind essential minerals
  • It has a built-in auto shut valve that will help you not to waste any water
  • It has a high capacity of up to 1600 gallon


  • Not NSF certified
  • Some users complained of leaks

Buyers guide

All these filters are great under sink water filters that may get confusing on which one to choose. If you have a hard time choosing the best one, we don’t blame you at all. They have both been made with the highest quality so that they are functional and serve you.

We will, however, make things easy for you by doing by being particular so that it is easier for you to choose the right water filter. In this section, we explore what filters are best for what reasons. Here is a quick guide to help you out:

Best filter for well water: Well water is well known for having high water hardness levels and high acidity. As much as all the filters have been made to deal with contaminants and acidity, the iSpring US31, and Frizzlife water filter are well-meant for well water. The rest best work for previously treated water. If they are to do well water, they will not do a good job, or they will make the filters not to last long.

The best filter to avoid water wastage: As much as there is no specific filter that has been made for water wastage, there are those that have been meant to reduce wastage. The Frizzlife water filter has been made such that the cap has an auto-shut valve that you can use to close when you don’t need water. That will help you to save water.

Best filter in terms of capacity: When it comes to capacity, all the filters that we have reviewed have good capacities. The CuZn UC-200, however, has the highest capacity of up to 50k. That will make sure that it lasts long and serves you well in the long-run.

Most durable filter: As much as all the filters have been made with premium material to make sure that they last longer, the CuZn UC-200 water filter comes with a 5 years pro-rated warranty and a 90 days satisfaction guarantee. With that, you can be sure that it will last long and serve you well in the long run.

Most budget-friendly filter: When it comes to the price, the Frizzlife water filter is the cheapest as it only retails at $84.95. There are, however, different dimensions that you should bear in mind when looking at the cost such as the features. Frizzlife is also most budget-friendly as you only need to replace the core cartridge filter in case of any damage as opposed to replacing the whole system.

Our overall recommendation is the Frizzlife water filter. It is well-meant for well water, it has an auto-shut valve to prevent water wastage, and is budget-friendly.

When you are looking for a water filter, it is important to note that people have different needs and thus what is best for one may not be necessarily best for you. It is, therefore, important that you test your water to know the kind of contaminants in it so that you may know what to look for. It is also good to note that most of the time, you get what you pay for. That simply means if you are looking or quality and more features, you should be ready to pay the price. The filters are normally replaced every few months for it to work well. It is, therefore, important to find out how long you can use a certain filter before having to replace it.

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