The Culligan D-15 is a genuine replacement drinking water filter cartridge designed specifically for Culligan SY-1000 and US-EZ series undersink drinking water filtration systems. It installs directly into compatible Culligan undersink housings using a simple twist-on, twist-off EZ-Change design, making cartridge replacement quick and tool-free. This OEM Culligan cartridge ensures a proper seal and optimal performance within Culligan-branded systems.

The Culligan D-15 features a 5-micron rating and uses a carbon block media to reduce chlorine taste and odor, sediment, particulates (Class III), and bad tastes from your drinking water. It is tested and certified by NSF International against NSF/ANSI Standard 42 for aesthetic effects, delivering cleaner, better-tasting water directly from your undersink tap.

The Culligan D-15 cartridge has a rated filtration life of 500 gallons or approximately 6 months of typical household use, whichever comes first. Replacing the D-15 on schedule ensures consistent flow rate, proper chlorine and sediment reduction, and prevents bacterial buildup inside the cartridge. Households with heavier water usage or higher sediment levels may need to replace the cartridge sooner.

Thanks to Culligan’s EZ-Change design, replacing the D-15 takes less than a minute. Simply turn off the water supply valve to the system, twist the old cartridge a quarter turn counterclockwise, and pull it straight down to remove. Align the new D-15 cartridge with the head, push up, and twist clockwise a quarter turn until it locks. Turn the water supply back on and flush the new cartridge for 5 minutes before drinking to remove carbon fines.

Yes, the Culligan D-15 is NSF/ANSI Standard 42 certified for chlorine taste and odor reduction and particulate reduction (Class III). It carries a nominal 5-micron filtration rating, which captures fine sediment, rust flakes, and particulate matter while maintaining a strong flow rate at your undersink faucet. This certification provides third-party verification that the D-15 performs as claimed for aesthetic water quality improvements.