3M Compatible Pre-Carbon Filter (Sed/Carbon) (3MKOPRE)
Replacement for the 3M 3 & 4 vessel units. #2
Who needs this filter? Anyone who has a 4-vessel unit - it is the #2 filter on that system.
Also, if you have a 3-vessel unit and your water application is municipal (city) water, you will use a pre-carbon filter as your #1 filter.
Compatible for the 3MROP12 filter.