Replacement for the 3M 3 & 4 vessel units. #1 Filter

Who needs this filter? Anyone who has a 4-vessel unit - it is the #1 filter on that system.

Also, if you have a 3-vessel unit and your water application is well water, you will use a sediment filter as your #1 filter.

Compatible for the 3MROP411 filter

Want to have this AUTO-SHIPPED once a year? CLICK HERE