✔ ASOV (automatic shut off valve) is installed on your system for automatic top off water

For use with water that is very hard or has an excessive amount of rust

IF you are trying to remove something specific from your water

This DI cartridge contains the freshest high quality resin you can purchase on the planet

20" Activated Carbon Block 10" ✔ ASOV (automatic shut off20" 5 mic. Activated Carbon Block. 2. 5 GPM HFR (High Flow Rate) carbon block filters allow your membrane(s) to get ideal pressure for better rejection rates better membrane rejection rates = longer DI resin life. 20" 5 micron Carbon block Illustrations Diagrams Instructions How to Change Filters