The Culligan® EZ-Change Under-Sink Drinking Water Filtration System (Model US-EZ-1) is a compact, high-capacity water filtration solution designed for residential use. With a filtration capacity of 3,000 gallons and Level 1 certification, the system is intended to reduce chlorine and particulates from drinking water. This article provides a detailed, step-by-step overview of the installation process, operational instructions, and maintenance requirements for the US-EZ-1 system, based exclusively on the provided documentation.
Introduction
The US-EZ-1 is a point-of-use filtration system that is installed under the kitchen sink to provide clean, filtered drinking water. The system includes a lead-free faucet, filter head with bracket, filter cartridge, mounting hardware, and 1⁄4-inch plastic tubing. Designed for DIY installation, it requires basic tools such as a screwdriver, drill, utility knife, and adjustable wrench. The system must be installed in accordance with its operating specifications, including pressure and temperature ranges, to ensure safe and effective performance.
The installation process is outlined in detail in the official Culligan documentation, and this article follows that structure while emphasizing best practices and key technical considerations. The system is certified for chlorine and particulate reduction and is suitable for use with disinfected water sources. Users are advised to follow all precautions, particularly those related to freezing temperatures and the limited service life of the filter head.
System Overview and Specifications
The Culligan US-EZ-1 system is designed for use in residential kitchens and is intended to filter cold water from a standard 1/2-inch-14 NPS threaded supply line. Key specifications include:
- Filter Capacity: 3,000 gallons (11,356 liters)
- Rated Service Flow: 0.5 gallons per minute (1.9 liters per minute)
- Operating Pressure Range: 30–100 psi (2.1–6.9 bar)
- Operating Temperature Range: 40–100°F (4.4–37.7°C)
- Maximum Turbidity: 5 NTU (Nephelometric Turbidity Units)
- Certifications: UL Listed, GSA Approved, Made in the USA, TAA/BAA Compliant, ADA Compliant, AbilityOne Certified
The system includes the following components:
- Filter head with built-in bracket
- Filter cartridge
- Mounting screws
- Water supply adapter
- Lead-free faucet and fittings
- 1⁄4-inch plastic tubing
- Cartridge change reminder sticker
Optional materials may include a 3" x 3" x 1/2" wood block, 1/8-inch drill bit, and other tools for sink preparation.
Installation Process
1. Selecting the Faucet Location
The first step in installation involves selecting a suitable location for the drinking water faucet. The faucet must be positioned for both functional and aesthetic reasons, ensuring ease of access and proper clearance for the filter system. The base of the faucet requires a flat surface to rest securely. The faucet is designed to fit through a 9/16-inch hole, and many sinks already have pre-drilled 1 3/8-inch or 1 1/2-inch holes that can be used.
2. Mounting the Faucet
Once the location is selected, the faucet is mounted using the provided mounting hardware. A phillips screwdriver and drill are required to secure the faucet to the sink. If the sink hole is too large or irregular, a wood block or other filler material may be used to create a stable base. The faucet should be positioned so that it does not interfere with the use of the main sink faucet or other fixtures.
3. Installing the Water Supply Adapter
The next step involves installing the water supply adapter, which connects the filter system to the cold water line. The adapter is typically attached to the existing water line behind the sink. Users should ensure that the adapter is properly tightened and sealed using Teflon tape to prevent leaks. A wrench may be required for this step.
4. Mounting the Filter System
The filter head is mounted using the included bracket and screws. The bracket is secured to the underside of the sink, and the filter head is then attached to the bracket. It is important to ensure that the filter head is level and securely fastened to prevent movement or vibration during operation.
5. Connecting the Supply Adapter and Inlet of Filter
Once the filter head is mounted, the supply adapter is connected to the inlet of the filter. This connection is made using the 1⁄4-inch plastic tubing included in the kit. The tubing must be cut squarely and free of scratches or damage to ensure a proper seal. A utility knife is recommended for cutting the tubing.
The tubing is inserted into the adapter and tightened using the gray collar on the fitting. If the tubing is damaged or cut unevenly, it should be trimmed by 1/2-inch to 5/8-inch and re-installed. The connection should be checked for leaks before proceeding.
6. Connecting the Faucet
The faucet is connected to the filter system using the included plastic tubing. This step is similar to the previous one, with the tubing being inserted into the faucet fitting and tightened with the gray collar. Again, the tubing must be cut cleanly and free of scratches. After installation, the faucet should be turned on to check for leaks.
7. Installing the Cartridge
The filter cartridge is installed by inserting it into the filter head. The head should be empty of water before inserting the cartridge to avoid spillage. The cartridge is designed to be user-replaceable and does not require special tools for installation. A cartridge change reminder sticker is included to help users track when the filter should be replaced.
8. Putting the Filter into Operation
After all components are installed and connections are verified, the filter system can be put into operation. The water supply valve should be opened gradually to allow air to escape from the system. The drinking water faucet should be turned on to release any trapped air and to check for leaks. Once the system is running smoothly, the filter is ready for use.
Filter Cartridge Replacement
The filter cartridge is a consumable component that must be replaced at regular intervals to maintain the system's performance. The recommended replacement interval is based on the filter's capacity of 3,000 gallons. Users should monitor their water usage and replace the cartridge when the capacity is reached or when the cartridge change reminder sticker indicates it is time.
To replace the cartridge, the water supply should be turned off, and the drinking water faucet should be turned on to relieve pressure in the system. The old cartridge can then be removed by pressing the grey collar on the filter head and pulling the cartridge out. The new cartridge is inserted in the same manner, and the system is repressurized by turning the water supply back on.
Alternate Installation Options
In some cases, the standard installation method may not be feasible due to sink design or plumbing constraints. An alternate installation option is available for users who require a different configuration. This may include using a different type of water supply adapter or adjusting the mounting position of the filter head. However, any modifications should be made in accordance with the manufacturer's instructions to ensure proper function and safety.
Troubleshooting Common Issues
Leaks
Leaking is one of the most common issues that can occur during or after installation. Leaks may occur at various points, including:
- Between the filter head and cartridge
- From the fittings
- On the supply adapter connection
- On the faucet/tubing connection
To address leaks, users should first turn off the water supply and inspect the affected area. If the leak is due to scratched or damaged tubing, the tubing should be cut off by 1/2-inch to 5/8-inch and re-installed. If the leak persists, the fitting should be tightened with a wrench or reconnected according to the installation instructions.
Performance Issues
If the system is not performing as expected, users should check the following:
- Filter cartridge condition: A worn or expired cartridge may not provide adequate filtration.
- Water pressure: The system is designed to operate within a specific pressure range. If the water pressure is too low or too high, the system may not function properly.
- Temperature: The filter should not be used with water that is below 40°F (4.4°C) or above 100°F (37.7°C). Cold water should be used to prevent damage to the filter components.
Precautions and Safety Guidelines
Microbiological Safety
The system is not designed to remove microbiologically unsafe water. Users should not install or use the filter with water of unknown quality unless it has been adequately disinfected. If the water source is suspected of containing harmful microorganisms, a disinfection system should be used in addition to the filter.
Freezing Temperatures
The filter system must be protected from freezing temperatures. Exposure to freezing conditions can cause the filter to crack and result in water leakage. If the system is to be left unattended for an extended period, the water supply should be turned off to prevent damage.
Filter Head Replacement
The filter head has a limited service life and should be replaced every ten years to prevent costly repairs or water damage. If the filter head has been in use for longer than this period, it should be replaced immediately. New filter heads should be labeled with the current date to indicate the next recommended replacement date.
Performance Data and Certification
The Culligan US-EZ-1 system is certified for the reduction of chlorine and particulates in drinking water. Performance data for the RC-EZ-1 and RC-EZ-3 cartridges includes:
- Chlorine reduction: The system reduces chlorine by a minimum of 50%, with average reductions reaching up to 97.4%.
- Particulate reduction: The system reduces particulates (5µm to <15µm) by at least 85%, with average reductions reaching up to 99.9%.
These performance standards are based on standardized testing procedures and are intended to ensure the system's effectiveness in improving water quality.
Maintenance and Long-Term Use
To ensure the long-term performance and safety of the system, users should follow these maintenance practices:
- Replace the filter cartridge at the recommended intervals.
- Inspect the filter head and tubing for signs of wear or damage.
- Check all connections for leaks on a regular basis.
- Store the system in a location that is free from freezing conditions.
If the system is not going to be used for an extended period, the water supply should be turned off to prevent damage to the components. When resuming use, the system should be flushed to remove any stagnant water and ensure proper function.
Conclusion
The Culligan US-EZ-1 under-sink water filtration system is a reliable and user-friendly solution for improving drinking water quality. With a high filtration capacity and certified performance, it is well-suited for residential use in kitchens. The system is designed for DIY installation and requires only basic tools and technical knowledge to set up.
Users should follow the installation and maintenance instructions carefully to ensure safe and effective operation. Regular filter cartridge replacement and periodic inspections are essential for maintaining the system's performance and longevity. By adhering to the manufacturer's guidelines, users can enjoy clean, filtered water for years to come.