The 3M UT-V390-C1 is a front-filter cartridge designed for the 3M™ Extreme High-Efficiency Smart Dual-Action Water Filtration System (UT-V390). It acts as the first stage of filtration in this under-sink system to remove sediment and protect the main filter. 

Key Features and Benefits:

Filtration Technology: Utilizes high-precision pleated membrane technology for surface filtration to remove smaller particles.

Scale Inhibition: Contains polyphosphate (scale inhibitor) to effectively reduce scale buildup.

Protection: Protects the post-PES (polyethersulfone) sterilization membrane to extend the life and effectiveness of the main filter cartridge.

Performance: Features a 1-micron rating and a flow rate of 2.8 liters per minute. 

Usage Information:

System: Designed specifically for the UT-V390 series.

Replacement: The C1 cartridge is the pre-filter, while the C2 (sold separately) acts as the main filter.

Maintenance: Easy to replace, typically requiring a 1/4 turn, similar to other 3M sanitary quick-change systems. 

This cartridge is crucial for maintaining optimal water quality in high-efficiency systems where sediment and scale are significant concerns.