In today’s health-conscious world, ensuring access to clean, safe drinking water is more important than ever. One of the most effective ways to guarantee the purity of your drinking water is by using an undersink water filter system. These systems are incredibly efficient at removing contaminants, but regular maintenance, including changing the water filter cartridge, is essential to maintain their effectiveness. This guide, brought to you by ESD Water, will walk you through how to change water filter cartridge under the sink, ensuring you continue to enjoy clean water without any hassle.


Regular Maintenance is Key for Your Under-Sink Water Filter

Maintaining your under-sink water filter is about ensuring the system’s longevity and safeguarding your health and well-being.

  • Ensures Water Quality: Regular changes keep water safe, free from harmful contaminants, and tasting fresh.
  • Health Protection: Prevents bacteria and mold buildup, ensuring your water doesn’t compromise your health.
  • System Efficiency: Avoids clogs and maintains optimal flow, extending the filter’s lifespan and performance.
  • Cost Savings: Reduces reliance on bottled water and prevents expensive repairs, making it a financially wise choice.


Understanding Your Undersink Water Filter System

Before diving into the filter change process, it’s crucial to have a basic understanding of your undersink water filter. The typical system, such as ESD Water’s ESD-US4, is renowned for its reliability and ease of use, boasting a capacity of 35,000 gallons of flow-through before a recommended change-out. This performance is unparalleled, especially compared to other filters requiring cartridge changes.


Preparing for the Change

First and foremost, gather all necessary tools and the replacement cartridge. Ensure you’ve purchased the correct cartridge for your model – a detail that ESD Water can help you with through our customer support or website.

  • Turn Off the Water Supply: Locate the cold water valve under the sink and turn it off to prevent water from flowing while you work.
  • Relieve Pressure: Turn on the faucet connected to the filter system to drain any remaining water and relieve pressure in the system.
  • Prepare Your Workspace: Place a towel or a small bucket under the filter unit to catch any drips or spills during the cartridge change.


Changing the Cartridge

ESD Water ensures a straightforward and hassle-free experience when replacing your water filter cartridge. Here’s how:

  • Remove the Old Cartridge: Depending on your model, you might need to unscrew the housing. For ESD Water systems, follow the instructions in your user manual to avoid mishaps.
  • Clean the Housing: With the old cartridge removed, clean the inside with a damp cloth. Check for sediment or debris and ensure the O-ring seal is in good condition.
  • Install the New Cartridge: Carefully insert the new cartridge into the housing. Make sure it’s securely in place and that there’s no cross-threading when you screw the housing back on.
  • Turn the Water Back On. Slowly turn on the water supply and then check for leaks. If you notice any drips, tighten the housing, but be careful not to over-tighten.


Post-Installation Checks

After installing the new cartridge, let the water run for a few minutes to remove any air and carbon fines from the system. Then, check the water flow and ensure no pressure drops or leaks.


The Advantages of ESD Water Filters

While changing cartridges is necessary for some systems, the advantages of ESD Water’s filtration solutions, particularly the ESD-US4 model, are worth noting.

  • Sealed Filter Design: The ESD-US4 model features a unique sealed filter design that eliminates frequent cartridge changes, setting it apart from other systems that require regular maintenance.
  • Unparalleled Convenience: The sealed system offers unparalleled convenience. Users don’t need to remember to purchase or change cartridges periodically, making it a hassle-free solution for clean water.
  • Efficiency: The efficiency of ESD-US4 is unmatched. Designed to last through 35,000 gallons of water filtration, it outperforms replaceable cartridge filters in both lifespan and performance.
  • Peace of Mind: Investing in an ESD Water filtration system means securing peace of mind. Users can be confident in consistently delivering clean, safe drinking water.
  • Highest Water Quality: ESD Water commits to providing the highest water quality. Our systems are designed to remove contaminants effectively, ensuring your water is safe to drink and tastes great.
  • Low Maintenance: The design of ESD Water’s undersink filters significantly reduces the time and effort required for maintenance. This advantage makes ESD Water filters an ideal choice for busy households.


Reliability and Ease of Use

Our filtration solutions are designed with the consumer’s needs at the forefront, ensuring that reliability and ease of use are not just features but foundational elements of their products.

  • High-Quality Materials: ESD Water uses only the best filter materials, ensuring durability and long-term performance.
  • Advanced Filtration Technology: Our systems employ cutting-edge technology to remove contaminants effectively, providing consistently clean water.
  • Simple Installation: Our systems are designed for straightforward installation, making it easy for homeowners to set up without professional help.
  • User-Friendly Maintenance: The design of our filters, such as the no-cartridge ESD-US4 model, minimizes maintenance efforts while maximizing efficiency.



Changing your under-sink water filter cartridge is a simple but crucial task in ensuring the quality of your drinking water. By following this guide, you can learn how to change the water filter cartridge under the sink, guaranteeing the delivery of clean, safe water to your home. Meanwhile, ESD Water is here to provide top-quality filtration solutions and support and with our ESD-US4 filter you won’t even be bothered by the necessity of changing filters . Explore our website for more information on our innovative products and how they can enhance your water quality today.