Culligan US Change Sink Drinking Water System - EZ-4

In this review the Culligan US Change Sink Drinking Water System with Dedicated Faucet (EZ-4) is evaluated for homeowners who want a simple under-sink filter that produces noticeably better tasting water for drinking and cooking. The biggest reason to buy is the EZ-4's easy twist-on/off filter cartridge and included dedicated faucet, which remove the usual mess and tools from cartridge changes while delivering water free of chlorine taste and a range of contaminants. For families or cooks wanting a tidy, effective under-sink solution, this system is built around convenience and proven filtration.

Key Features

• Easy-Change Cartridge: The twist-on/off RC-EZ-4 cartridge swaps without wrenches or buckets, making maintenance fast and clean.
• Comprehensive Contaminant Reduction: Certified reductions include chlorine taste and odor, lead, mercury, cysts and several VOCs for safer drinking water.
• Dedicated Faucet: A separate chrome faucet is included so drinking water is kept distinct from regular tap water for better hygiene.
• Filter Life Indicator: The built-in LED filter life indicator removes guesswork about when to replace the cartridge for consistent performance.
• Size and Flow: The system delivers up to 0.5 GPM, which balances steady dispensing at the dedicated faucet without high-pressure plumbing changes.
• Complete Kit: Tubing and installation hardware are included so the system is ready to install under most sinks without extra parts.

Who It's For

The Culligan EZ-4 is best for households wanting a dedicated under-sink drinking water line that is easy to install and simple to maintain, particularly families concerned about chlorine taste, lead, mercury and other contaminants certified by IAPMO to NSF/ANSI standards. It suits renters or homeowners who prefer a tidy, separate faucet for drinking and cooking water without replacing an entire faucet or reworking existing plumbing.

Those who need rapid high-flow filtration for filling large pots, or who prefer whole-home treatment rather than a drinking faucet, should look elsewhere. Also, anyone requiring specialty filtration beyond the listed reductions should verify contaminants of concern before purchase.

Pros & Cons

Pros

• Includes a dedicated chrome faucet and all tubing and hardware for under-sink installation, reducing setup hassle.
• RC-EZ-4 cartridge is easy to change with the twist-on/off design and the LED indicator helps time replacements.
• Certified to reduce chlorine taste and odor plus a range of contaminants including lead, mercury, cysts and VOCs.
• Filter lifespan of up to 6 months or 500 gallons provides a predictable maintenance interval for typical households.

Cons

• Maximum flow of 0.5 GPM is modest, so dispensing large volumes is slower than a full kitchen tap.
• Filter life depends on water conditions and usage, so heavy-use homes may need cartridge changes more often than the stated maximum.

Specifications

Brand	Culligan
Model	US Change EZ-4 (with RC-EZ-4 cartridge)
Flow rate	0.5 GPM
Filter life	Up to 6 months or 500 gallons
Certifications	Tested/certified by IAPMO to NSF/ANSI 42 and 53
Includes	Twist-on/off cartridge, tubing, dedicated faucet, installation hardware

Our Verdict

The Culligan US Change EZ-4 is a sensible under-sink drinking water solution for households that value easy maintenance and certified contaminant reduction. Its twist-on/off cartridge, LED life indicator and included dedicated faucet make it a convenient upgrade for drinking and cooking water. While flow is moderate, the system offers good value for those focused on taste and targeted contaminant removal without complicated installation.

Frequently Asked Questions

How long does the filter cartridge last?
The RC-EZ-4 cartridge is rated for up to 6 months or 500 gallons, depending on your water conditions and household usage.

Is the dedicated faucet included?
Yes, a chrome dedicated faucet is included along with tubing and installation hardware for under-sink setup.

What contaminants does it reduce?
The system is IAPMO tested to NSF/ANSI 42 and 53 for reductions including chlorine taste and odor, lead, mercury, cysts, VOCs, MTBE and turbidity.