Ensure pure drinking water with this 4-stage replacement pack designed specifically for the iSpring CU-A4 Ultrafiltration System. Utilizing advanced UF Hollow Fiber technology, it effectively removes 99.9999% of bacteria and protozoa while filtering out VOCs, heavy metals, and unpleasant odors.

• 1st Stage: 5-micron sediment filter removes rust, sand, and solid impurities to protect the delicate UF membrane (6-month lifespan).
• 3rd Stage: KDF media with activated carbon kills algae and fungi, controls bacteria, and removes chlorine, heavy metals, and organic compounds while adding healthy zinc ions (6-month lifespan).
• 4th Stage: Fine coconut shell activated carbon absorbs residual chlorine, organics, humus, and odors (6-month lifespan).
• Advanced UF Hollow Fiber Technology: Certified 0.1 micron absolute filtration removes bacteria and protozoa at higher rates than EPA guidelines.
• Easy Installation: Features a unique swivel-valve, push-button assembly for quick setup and works effectively at low water pressure.