
Installing an under sink water filtration system with faucet can be a game-changer for your home's water quality. According to our research, a well-designed system can remove up to 99% of contaminants from your drinking water.
A typical under sink system consists of a filtration unit and a faucet, which can be easily mounted under the sink. The filtration unit usually has a replaceable filter cartridge that needs to be replaced every 6-12 months, depending on usage.
The benefits of using an under sink system are numerous, including improved taste and odor, reduced risk of waterborne diseases, and even lower water bills.
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Benefits
Having a clean and healthy water supply is essential for our overall well-being, and an under sink water filtration system with faucet can provide just that.
Installing an under sink water filtration system can help reduce exposure to environmental toxins.
With an under sink system, you can enjoy clean water straight from the tap without taking up valuable counter or fridge space.
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These systems are designed to remove more contaminants than most pitcher-based options, including chlorine, chloramines, and lead.
This is especially important since municipalities often use chemicals like chlorine and chloramines to treat drinking water, but the process can miss other contaminants that may be detrimental to your health.
Under sink water filtration systems can provide a constant supply of filtered water, making it a convenient option for your family's daily needs.
By using an under sink system, you can reduce your reliance on single-use plastic water bottles and minimize your carbon footprint.
Here are some of the benefits of having an under sink water filtration system with faucet:
- Filters out harsh chemicals from your water
- Improves indoor air quality by removing chemicals that evaporate and contaminate the air
- Lessens sediment and scale-build up that can harm your pipes and appliances
Installation and Maintenance
Installing an under sink water filtration system with faucet is a relatively straightforward process. Each system comes with its own detailed step-by-step instructions and a video guide to simplify the setup process.
Some systems are simple to install, especially those with carbon filters, but larger RO systems may require professional installation, especially if you need to drill an additional hole in your sink for a separate faucet.
Replacing filters and maintaining your system is also crucial for optimal performance. Replacements are quick and easy, but the frequency of replacement will vary depending on use and the system purchased.
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Installing and Replacing Filters
Installing filters is a straightforward process, and Aquasana under sink water filtration systems come with detailed step-by-step installation instructions and video guides to simplify the setup process.
Replacing filters is quick and easy, but the frequency depends on use and the system purchased. You can find more information on replacement frequency on the Aquasana under sink and countertop filter replacement page.
If you're unsure about which replacement parts you need, you can check out the suggested replacement duration, which is 6-8 months, or choose a 1-year replacement set to save money.
Replacement parts include the AF-1001 Sediment Filter Cartridge and the AF-1000 Carbon Block Replacement Filter, which can be purchased individually or as a set.
It's worth noting that the replacement age of filters depends on the gallons per day (GPD) consumed and the quality of the water.
Here's a breakdown of the replacement parts:
- 1-year Replacement Set
- AF-1001 Sediment Filter Cartridge
- AF-1000 Carbon Block Replacement Filter
Ease of Installation
Installing an under-sink water filter is a straightforward process, and many systems come with detailed step-by-step instructions and video guides to help simplify the setup process.

Some under-sink filters are simple to install, especially those with carbon filters, but larger RO systems may require professional installation if they need an additional hole in the sink for a separate faucet.
Replacing filters and maintaining the system is also important, and some under-sink filters require more hands-on management than others.
Replacing components in Aquasana under sink water filtration systems will vary in frequency depending on use and the system purchased, so be sure to check their replacement page for more information.
It's a good idea to consider whether you want to take on a DIY project or let an expert handle the installation, and to learn how to change filters and maintain your system.
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Who It's For
An under sink water filtration system with faucet is perfect for households with 1-4 people, as it can effectively filter up to 1 gallon of water per minute. This makes it ideal for small to medium-sized families.
For those who are concerned about the environment, this system is a great option as it reduces plastic waste and the need for bottled water. This is especially true for families who drink a lot of water throughout the day.
If you're looking for a system that's easy to install and maintain, this under sink filtration system is a great choice.
Who This Is For
This is for anyone who wants to ensure their family's health and safety by filtering out contaminants from their tap water. You can choose from a variety of under sink water filters that fit your home's unique needs.
If you live in an area with poor water quality, an under sink water filter can be a lifesaver. Aquasana's under sink water filters are designed to remove up to 99.99% of 90 contaminants, including fluoride and arsenic.
If you're not sure what level of filtration you need, start by reading your water quality report. This will give you an idea of what contaminants are present in your water and what level of filtration you'll need.

You can choose from a range of under sink water filters, each with its own unique features. For example, the SmartFlow Reverse Osmosis system combines Claryum and reverse osmosis filtration with patented SmartFlow technology to efficiently remove contaminants.
Here are some of the options you can consider:
- SmartFlow Reverse Osmosis: Our most powerful under sink water filter, this system combines Claryum and reverse osmosis filtration with our patented SmartFlow technology
- Claryum 2-Stage: Removes up to 99% of 78 contaminants including chlorine, lead, PFAS, and microplastics
- Claryum 3-Stage: Removes up to 99% of 78 contaminants and includes a pre-filter to tackle sediment and rust
- Claryum 3-Stage Max Flow: An upgraded version of the Claryum 3-Stage, now featuring a 44% faster flow rate and 800 gallons of filter life
- Claryum Direct Connect: An easy to install, fast-flowing water filter that connects directly to your existing faucet and removes up to 99% of 78 harmful contaminants
Ultimately, the right under sink water filter for you will depend on your specific needs and preferences. Be sure to do your research and choose a filter that meets your needs and budget.
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Do You Need a Filter?
You might wonder if you really need a water filter, but the truth is, it's not a simple yes or no answer. The EPA regulates public water supplies, but not all contaminants are accounted for.
In the United States, public water supplies are regulated by the EPA under the Clean Water Act, but contaminants can still enter the water after it leaves the treatment plant. This can happen through leaky pipes or pipes that leach contaminants.
Older homes and communities are at a greater risk of downstream contamination. Homes built before 1986 are more likely to have lead pipes, fixtures, and solder that don't meet current codes.
The age of your home or community is a significant factor in determining the risk of downstream contamination. The EPA says that older homes are more likely to have lead pipes and fixtures.
To know exactly what's in your water, you can find your local supplier's EPA-mandated Consumer Confidence Report online or request it from them.
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Features and Performance
The under sink water filtration system with faucet is designed to provide clean and safe drinking water, and it does so with impressive features and performance.
This system is designed to minimize water wastage, unlike other under counter/sink filter systems. It includes a sleek designer chrome finish faucet that matches modern kitchens and has a non-air gap design, eliminating the gurgling sound often associated with these systems.
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One of the standout features of this system is its ability to remove a wide range of contaminants from the water. The system includes a stage 1 filter that removes suspended materials down to 5 microns, as well as a stage 2 filter that removes heavy metals, iron, and hydrogen sulfide. This is followed by a stage 3 filter that reduces compounds that contribute to bad taste and odor.
Here are the key features of this under sink water filtration system with faucet:
- No water wastage like other under counter/sink filter systems.
- Stage 1 - NSF Polypropylene sediment pre-filter to extract suspended materials such as sediment, silt, rust, insects, and other particles down to 5 micron.
- Stage 2 (multi-stage) - KDF-85 removes heavy metals, iron and hydrogen sulfide, controls scale and microorganisms such as bacteria and algae.
- Stage 3 - 5 micron NSF High purity coconut shell activated carbon block filters reduces compounds that contribute to bad taste and odor.
Same Performance, Different Name
You might have noticed that some water filtration systems have similar features and performance, but with different names. This is exactly what happened with the Aquasana AQ-5200 and a system exclusive to Lowe's. They're identical in certifications, specs, and size.
In fact, the HomeWater 4-Stage Reverse Osmosis Under Counter Water Filter has the same level of filtration as the Aquasana AQ-5200. It uses a semi-permeable membrane to rinse contaminants to the drain, producing high-quality, filtered drinking water. This system is also similar in size and certifications.

However, the HomeWater system has a few extra features, such as a sealed tank to store filtered water and a lead-free faucet for easy access. If you're looking for a system with similar performance but different branding, you might want to consider the HomeWater option.
Here's a comparison of the two systems:
As you can see, the HomeWater system has the same level of certifications and filtration as the Aquasana AQ-5200. The only difference is the branding and some extra features.
Good Flow Rate
Good flow rate is crucial for an under-sink filtration system. A good flow rate ensures that you get clean drinking water quickly, without having to wait for a long time.
Some under-sink filtration systems are designed to maximize the flow rate, despite having multiple levels of filtration. However, if your home has very low water pressure, it may take a long time to fill a large pot with filtered water.
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A system with a good flow rate can make a big difference in your daily routine. For example, the system mentioned in Example 1 has a non-air gap faucet that provides smooth operation and precise flow control.
Here are some key features to look for in an under-sink filtration system with a good flow rate:
- Advanced ceramic disc valve structure
- Non-air gap faucet with one water line
These features can help ensure that you get clean drinking water quickly and efficiently.
Product Details
The under sink water filtration system with faucet is a great way to ensure clean drinking water, and in this section, we'll dive into the product details.
The AF-4004 model has a weight of 14lb, which is a decent size, but not too bulky to fit under most sinks.
This system has a flow rate of 1.5 gpm, which is a good amount of water for a single faucet. It's also NSF certified, which gives you peace of mind knowing it meets safety standards.
The product dimensions are 15 3/8"L x 14"H x 5 3/4"W, so make sure to check your sink's clearance before purchasing.
Here are the key specifications at a glance:
- Model Number: AF-4004
- Flow Rate: 1.5 gpm
- Product Weight: 14lb
- Dimensions: 15 3/8"L x 14"H x 5 3/4"W
The system has a capacity estimate of 2000 gallons, which should last you a while, and a max pressure of 90 psi, which is suitable for most household water pressure.
Comparison and Recommendations
If you're considering an under sink water filtration system with faucet, it's essential to think about the type of contaminants you want to remove. Some systems can filter out up to 99% of chlorine, lead, and other impurities.
The size of the system is also crucial, as it needs to fit under your sink and accommodate your water flow needs. For example, the Aquasana under sink system measures 10 inches wide and 16 inches deep, making it a compact option for most kitchens.
In terms of maintenance, some systems require more upkeep than others. For instance, the PUR PFM400H faucet-mounted system requires replacement of its filter every 6 months, while the Culligan FM-15A under sink system has a replaceable filter that lasts for up to 2 years.
The Competition

The Hahn 3-stage 600-gallon is a re-branded version of the Aquasana AQ-5300, with the same 77 ANSI/NSF certifications as the Aquasana 5200, 5300, and 5300+ Max Flow.
It has a sediment prefilter, which can be beneficial for people with high sediment in their pipes. If you see it at a competitive price, it's a solid choice.
The Aquasana AQ-5300 is physically almost identical to the AQ-5200 but adds a sediment prefilter to help extend the contaminant filters' lifespans.
Brondell's popular H2O+ Coral UC300l has lead and VOC certification but no Standard 401 "emerging contaminants" certifications.
The 3M Aqua-Pure AP-DWS1000 costs considerably more than our picks and lacks Standard 401 "emerging contaminants" certifications.
The Body Glove BG-12000 is rated to a relatively high 0.75 gpm and 750 gallons but has fewer certifications than our picks and costs more than $500.
Flaws, Not Dealbreakers
The Aquasana AQ-5200 has a lower maximum flow rate than some competitors, coming in at 0.5 gpm compared to 0.72 or more. This is due to its physically small filters.

It also has a lower capacity, with a rating of 500 gallons compared to 750 or more from other systems. However, its compactness makes up for these minor drawbacks.
If you're looking for higher flow and capacity, the Aquasana AQ-5300+ is a good option, rated to 0.72 gpm and 800 gallons, but sharing the same six-month filter-replacement schedule as the AQ-5200.
The AQ-5200's instruction manual is a bit sloppy, with some parts not shown on the parts list or diagram. This might cause some confusion, but it's not a major issue.
The manual is not unique to the AQ-5200, as many under-sink filters' manuals are similarly lacking. Aquasana has provided a helpful video to guide installation.
It's essential to be careful when installing the AQ-5200 to avoid catastrophic failure, which can cause severe water damage. Make sure to secure the hose connections and turn the water back on slowly to catch any leaks.
The Aquasana AQ-5200 comes with its own separate faucet, which may not match your style. If you prefer a different faucet, you can install one as long as it has a ⅜ inch connection.
Frequently Asked Questions
What are the disadvantages of an under sink water purifier?
Under-sink water purifiers have limited coverage, only filtering water at the installed tap, and require a more involved installation process compared to countertop filters.
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