DIY installation of side mount faucet in kitchen

Unlock Pure Water: How to Easily Install a Side Mount Faucet and Water Filter Under Your Sink

Importance of Clean Drinking Water

The significance of clean drinking water cannot be overstated. It is not only essential for hydration but plays a critical role in maintaining overall health. Water helps in digestion, aids in nutrient absorption, and is vital for detoxifying the body by helping flush out toxins. The presence of contaminants like lead, chlorine, pesticides, and bacterial pathogens in water can lead to serious health issues, including gastrointestinal diseases, neurological disorders, and reproductive problems. Therefore, ensuring access to uncontaminated water is crucial for preventing disease and promoting general well-being.

Close-up of under-sink water filtration system installation

Benefits of Installing an Under-Sink Water Filtration System

Installing an under-sink water filtration system brings several key benefits that can enhance your daily living:

Consistent Quality

This system provides a constant supply of clean and great-tasting water, devoid of common water impurities and unpleasant tastes or odors caused by chlorine and other chemicals.

Space-Saving Design

Unlike bulky countertop units, under-sink filters are compact and installed out of sight, preserving the aesthetic of your kitchen without sacrificing valuable counter space.


Although there is an upfront investment, using an under-sink filtration system is more economical compared to the ongoing cost of bottled water, paying off in savings over time.


It offers instant access to purified water, eliminating the wait time associated with refrigerator pitchers or faucet attachments, and simplifies the process of getting clean water for cooking and drinking.

Final setup of under-sink water filtration system

Photo by Bluewater Sweden on Unsplash

What is an Under-Sink Water Filtration System?

An under-sink water filtration system is a mechanical unit that is installed under the kitchen sink to filter out impurities from the water before it reaches your tap. This system is connected directly to the water line and typically includes a dedicated faucet or connects to the existing faucet, providing easy access to purified water.

Definition and Purpose

The primary goal of an under-sink water filtration system is to enhance the quality and taste of tap water, making it safe for drinking and cooking. It achieves this by removing physical, chemical, and biological contaminants that can adversely affect health and provide a poor taste and smell.

Types of Filters Typically Used

The effectiveness of an under-sink water filtration system largely depends on the type of filter used. Common types include:

Carbon Block Filters

These are prevalent due to their efficiency in reducing odors and improving taste. They work through adsorption, trapping pollutants in the pores of the activated carbon.

Reverse Osmosis Filters

Known for providing the highest level of purification, these filters remove a comprehensive range of contaminants, including dissolved solids and heavy metals, through a semipermeable membrane.

Sediment Filters

These filters are used to remove large particles such as sand, dirt, and rust, which not only affect the clarity and taste of water but also protect and extend the life of other filters in the system by preventing clogging.

Why Choose a Side Mount Faucet?

Choosing a side mount faucet for your under-sink filtration system offers several advantages over traditional faucets:

Ease of Installation

Side mount faucets are typically easier to install as they can be placed in more flexible locations around the sink, depending on where the existing holes are or where new holes can be drilled without interference.

Space Efficiency

By being mounted to the side, these faucets can help keep the area around the main faucet uncluttered, maximizing the available space.


Side mount faucets are often more accessible, making it easier to fill pots or other large containers without having to maneuver them under a standard faucet.

Mounting filter system to cabinet side

Comparison with Other Faucet Types

Compared to standard faucets, side mount faucets provide enhanced maneuverability and can be a more practical choice in kitchens where space is at a premium. They offer a streamlined look and can be easier to use, particularly in setups where large pots and other vessels are frequently filled.

Tools and Materials Needed

To successfully install an under-sink water filtration system, certain tools and materials are required:

Tools Needed

Basic tools such as an adjustable wrench, drill (for creating a new faucet hole), screwdriver, tape measure, and safety glasses are essential.


The filtration system kit typically includes the filter itself, replacement cartridges, necessary tubing for connections, a side mount faucet, and various fittings and hardware required for installation.

Overview of Materials Provided in the Kit

Most kits come equipped with:

Filter Head and Bracket: To mount the filtration system securely under the sink.

Replacement Filter Cartridges: These are critical for maintenance and are replaced periodically to ensure the system's effectiveness.

Plastic Tubing: Used to connect the water supply to the filter and from the filter to the faucet.

Faucet: Specifically designed to dispense filtered water.

Adapters and Connectors: Essential for integrating the system with the existing plumbing setup.

Preparing for Installation

Proper installation begins with adequate preparation:

Clearing the Cabinet: It’s important to remove items to create space for the installation.

Cleaning the Area: Ensuring the installation space is clean will facilitate a smoother setup and help prevent contamination.

Safety Tips

Protective Gear: Wearing safety glasses during drilling and installation can prevent injury.

Awareness of Surroundings: Being cautious of existing plumbing and electrical lines is crucial to avoid accidental damage.

Filtered water being poured from side mount faucet

Step-by-Step Installation Guide

Detailed instructions help streamline the installation process:

Installing the Side Mount Faucet

Creating a Faucet Hole: If necessary, drill a hole in the sink or countertop at the marked location to fit the new faucet.

Mounting the Faucet: Place the faucet in the hole and secure it from underneath with the provided hardware, ensuring a tight fit to prevent leaks.

Connecting the Water Lines

Water Supply Shut Off: Always start by turning off the cold water supply to prevent flooding.

T-Adapter Installation: The T-adapter is connected to the cold water line, which allows the water to be directed both to the original faucet and the new filtration system.

Tubing Connections: Secure the tubing from the T-adapter to the filter's intake and from the filter's output back to the faucet, ensuring all connections are tight and leak-free.

Mounting the Filter System

Choosing the Best Position: The system should be mounted in a spot that is easily accessible for maintenance and away from potential disturbances.

Securing the System: Attach the system to the cabinet using the provided mounting screws, ensuring it is stable and secure.

Finalizing the Setup

Leak Testing: Once the system is connected, turn the water back on and check all connections for leaks, making adjustments as needed.

Securing Connections: Double-check that all connections are tight and secure to ensure the system functions properly without leaks.

Activating the Filtration System

Initial System Flush: Run the water through the system for approximately 5-10 minutes to remove any residual carbon fines or manufacturing residues.

Operational Check: Ensure that the water flow is steady and there are no signs of leaks or other malfunctions.

Maintenance and Upkeep

Regular maintenance is essential to ensure the system remains effective and efficient:

  • Regular Checks: It is recommended to inspect the system every six months for signs of wear or damage and to check for leaks.
  • Filter Replacement: The filter cartridges should be replaced according to the manufacturer's instructions, usually every 6-12 months depending on water usage and quality.

Troubleshooting Common Issues

Understanding how to identify and resolve common issues can save time and prevent damage:

  • Reduced Water Flow: This may indicate a clogged filter cartridge needing replacement.
  • Leaks: Tighten all connections and replace worn parts as necessary to resolve leaks.
Adjusting side mount faucet on kitchen sink

Benefits of the Installed Filtration System

The installation of an under-sink water filtration system offers numerous benefits, both immediately and over the long term:

Health Benefits

Provides reliable access to clean water, essential for health and wellness.

Cost Savings

Offers a cost-effective solution compared to continuous purchases of bottled water.


Ensures easy access to purified water directly from the tap without additional steps.

Environmental Impact

Installing a water filtration system also has significant environmental benefits:

Reduction in Plastic Waste

By reducing the reliance on bottled water, less plastic waste is generated, contributing to environmental conservation.

Resource Conservation

Minimizes the environmental footprint associated with the production and transport of bottled water.

Clean, clear water stream from newly installed faucet


An under-sink water filtration system with a side mount faucet is a wise investment for anyone looking to improve their water quality. By following this guide, you can ensure a successful installation, providing your household with clean, safe drinking water. Remember, investing in water quality is investing in your health and well-being.


1. What is the best location to install an under-sink water filtration system with a side mount faucet?

The optimal location for an under-sink water filtration system, especially one with a side mount faucet, is under the kitchen sink, mounted to the side of the cabinet. This placement is advantageous for several reasons:

Accessibility: Mounting the system to the side of the cabinet makes it easier to access for routine maintenance such as changing the filter cartridge or checking the system for leaks. It avoids the clutter and cramped space that often accompanies the piping and disposal units typically located at the center of the cabinet.

Space Efficiency: A side mount faucet does not require altering the central workspace of the sink, preserving valuable working area on the sink's deck. This setup is particularly beneficial in kitchens where space is limited.

Aesthetic and Practical Integration: A side mount faucet can often be integrated more seamlessly with existing kitchen decor and layout, maintaining the aesthetic integrity of the kitchen while being highly functional and accessible.

2. Can I install the system on my own?

Yes, many under-sink water filtration systems, including those with side mount faucets, are designed for DIY installation. These systems usually come with comprehensive instructions and all necessary installation hardware. It's important for DIY installers to:

Follow Instructions: Carefully read and follow the manufacturer's installation guide to ensure proper setup.

Check Compatibility: Verify that the system is compatible with your plumbing and sink configuration.

Prepare Tools: Have all the necessary tools on hand, such as drills, wrenches, and screwdrivers.

Take Safety Precautions: Ensure that water supply lines are shut off before beginning installation to avoid any accidental water damage.

3. How often do I need to change the filter?

The frequency of filter changes depends on several factors including the manufacturer’s guidelines, water usage, and the quality of the incoming water.


Standard Recommendation: Most filters need to be changed every 6 to 12 months.

Usage Dependent: If your water usage is high or the water supply carries a lot of sediments or contaminants, you might need to change the filter more frequently.

Water Quality Signs: Pay attention to changes in water taste, odor, or flow, as these can indicate that it’s time to replace the filter.

4. What do I do if my filtered water tastes strange?

If your filtered water begins to taste strange, follow these steps:

Flush the System: Initially, make sure to flush the new system or filter as per the manufacturer’s instructions to remove any carbon fines or manufacturing residues.

Check Installation: Ensure that the system is installed correctly and that all connections are secure, as improper installation can affect water quality.

Replace the Filter: If the strange taste persists, it may be time to replace the filter cartridge, especially if it hasn’t been changed as per the recommended schedule.

5. Are there any specific maintenance tips to follow for systems with a side mount faucet?

Maintaining an under-sink water filtration system with a side mount faucet involves regular checks and routine tasks to ensure optimal performance:

Regular Inspections: Check for leaks or drips around the faucet and connections. Even minor leaks can lead to water damage or affect system efficiency.

Secure Connections: Due to the side mount faucet’s positioning, it’s crucial to regularly ensure that all connections, especially those around the faucet, are tight and secure to handle the frequent operation.

Clean Faucet Area: Regularly clean the faucet area and handle to prevent buildup of dirt and ensure smooth operation.

Follow Manufacturer’s Guidelines: Adhere to the manufacturer's maintenance schedule for replacing filters and any other parts as needed to maintain the system’s performance.

Featured image: Image by freepik

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