The 3MROP412 GAC filter improves taste and odor and reduces chlorine in your water. It can serve as both a post and pre-filter for the SQC3 and SQC4 Water Factory RO systems. The 3MROP412 GAC filter can be used as a post or pre-filter in Water Factory 4-Stage RO Systems and as a post filter in Water Factory Countertop Systems. While the filter can be used as a pre- and post filter, it most often is used as a post filter.
