Swift Green Filters SGF-451 Fits for 3M CS-451, CS-452, CS-450 Filter (3 Pack)
It has 50% more micro-pores for capturing contaminants. [ AWARD WINNING SWIFT GREEN FILTERS ]. All Swift Green Filters are proudly manufactured in the USA. Certified Research and Testing to NSF/ANSI 42 for the specific performance claims verified and substantiated by test data.