Culligan RC-EZ-4
Culligan RC 4 EZ-Change Premium Water Filtration Replacement Cartridge User Manual
Model: RC-EZ-4 | Brand: Culligan
Product Overview
The Culligan RC-EZ-4 EZ-Change Level 4 Replacement Cartridge is designed to provide clean, great-tasting water for drinking and cooking. This premium filter reduces a wide range of contaminants, ensuring high-quality water directly from your tap or refrigerator.

This cartridge is compatible with Culligan US-EZ-1, US-EZ-3, and US-EZ-4 systems, offering a convenient and mess-free replacement process without the need for additional tools.

Installation and Setup
The EZ-Change design simplifies filter replacement, making it a quick and clean process. Follow these steps for proper installation:
- Turn off water supply: Locate the water supply valve to your filter system and turn it off. Dispense water from the faucet until the flow stops to relieve pressure.
- Relieve pressure: Press the red button on the system head to vent any remaining water drips.
- Remove old cartridge: Turn the arrow on the existing cartridge from the locked to the unlocked position. Gently pull down to remove the old cartridge.
- Insert new cartridge: Align the arrow on the new RC-EZ-4 cartridge with the unlocked position on the system head. Push the cartridge up firmly and turn it to the locked position.
- Check for leaks: Slowly turn on the water supply. Carefully inspect all connections for any signs of leaks. If leaks are detected, refer to the troubleshooting section.
- Flush the system: Flush water through your water faucet, kitchen valve, or refrigerator dispenser for 10 minutes to remove carbon fines and ensure optimal performance. Re-check for leaks after flushing.

Operating Principles
The Culligan RC-EZ-4 filter utilizes advanced filtration technology to significantly improve water quality. It is designed to reduce:
- Bad taste and odor
- Chlorine taste and odor
- Sediment
- Lead
- Cysts such as Cryptosporidium and Giardia
- Mercury
- Turbidity
- Particulate Class I
- VOC's (Volatile Organic Compounds)
- MTBE (Methyl Tertiary Butyl Ether)
- Chloramines
The filter operates by passing water through its internal media, trapping impurities and contaminants while allowing clean water to flow through. This process ensures that the water you consume is visibly clean and tastes great.
Maintenance
To maintain optimal filtration performance, it is crucial to replace your Culligan RC-EZ-4 filter cartridge regularly. The filter has a life expectancy of up to 500 gallons or 6 months, whichever comes first. This duration may vary depending on your water usage and the level of contaminants in your water supply.
Important Considerations:
- Freezing Protection: The filter must be protected from freezing temperatures. Freezing can cause the filter to crack, leading to water leaks and system damage.
- Replacement Schedule: Always replace the filter cartridge at the end of its stated life (500 gallons or 6 months) or within 3 years from the manufacturer date printed on the cartridge body, whichever occurs first.
Troubleshooting
While the Culligan EZ-Change system is designed for easy installation, occasional issues may arise. Here are some common troubleshooting tips:
- Water Leaks:
If you observe water leaks after installation or cartridge replacement, immediately turn off the water supply. Re-check that the cartridge is fully seated and turned to the locked position. Ensure all connections are secure. If the leak persists, carefully re-install the cartridge following the steps in the "Installation and Setup" section.
- Reduced Water Flow:
A significant reduction in water flow often indicates that the filter cartridge is nearing the end of its life and is becoming clogged with trapped contaminants. Replace the filter cartridge as soon as possible.
- Unpleasant Taste or Odor:
If the filtered water develops an unpleasant taste or odor, it suggests that the filter's capacity to remove these contaminants has been exhausted. Replace the filter cartridge immediately.
Specifications
| Feature | Detail |
|---|---|
| Brand | Culligan |
| Model Name | RC-EZ-4 |
| Installation Type | Under Sink (compatible systems) |
| Item Weight | 2.6 Pounds |
| Maximum Flow Rate | 0.5 Gallons Per Minute |
| Upper Temperature Rating | 100 Degrees Fahrenheit |
| Supported Water TDS Level Maximum | 500 PPM |
| Water Consumption (Capacity) | 500 Gallons |
| Certification | Tested/certified by IAPMO to NSF/ANSI Standard 42 for aesthetic reduction of Chlorine Taste/Odor, Chloramines, and Nominal Particulate Class 1; Standard 53 for reduction of Cysts, Mercury, lead, VOC, MTBE and Turbidity. |
| Size | EZ-4 (Best Filtration) |
| Style | Replacement Filter |
| Part Number | 01019057 |


Warranty Information
The Culligan RC-EZ-4 replacement cartridge is designed for a specific lifespan. The filter cartridge has a limited life and is not warranted beyond 6 months from the date of installation or beyond its stated capacity of 500 gallons, whichever comes first. Additionally, the filter is not warranted beyond 3 years from the manufacturer date printed on the cartridge body.
Please note: Failure to protect the filter from freezing temperatures may void the warranty, as freezing can cause physical damage to the cartridge.
Support and Contact
For additional support, product information, or to register for filter change reminders, please visit the official Culligan website or contact customer service:
- Website: www.culliganDIY.com
- Phone: 1-800-721-7360
- User Manual (PDF): Download PDF