Culligan D40 Level-4 Drinking Water Replacement Cartridge – 600-Gallon, 6-Month Life

Clean, refreshing water from your tap

The Culligan D40 Level-4 carbon block cartridge enhances the taste and clarity of water drawn from your kitchen faucet. Designed for easy installation on a 3/8-inch cold-water line and compatible with Culligan under-sink systems such as US-550, US-600, US-560, and CTR-210.

Engineered with activated carbon block technology, the D40A reduces common water annoyances while preserving essential minerals. Enjoy water that tastes more inviting for everyday use, from drinking and ice to cooking and hot beverages.

What it reduces and how it helps

• 0.5-micron nominal filtration to capture fine particles
• Reduces chlorine taste and odor and chloramine taste and odor
• Minimizes perceptible sediment, turbidity, and particulates
• Targets lead and mercury for cleaner, clearer water

Practical benefits for daily life

• Better-tasting water for drinking, coffee, and tea
• Improved flavor in soups, sauces, and baby formula preparation
• Hydration without relying on bottled water and related plastic waste

Performance you can rely on

With a life up to six months or 600 gallons, the D40 replacement cartridge provides dependable contaminant reduction and fresher water over months of use. The slim, compact design supports quick, tool-free cartridge changes.

Smart, eco-friendly choice

Reduce single-use plastic while maintaining high-quality water at home. This cartridge helps protect your under-sink filtration system's efficiency and can be swapped out without major disruption to your routine.