Review on Optimized Replacement Filter Kit for Vertex PT 4.0 RO System - Includes Carbon Block Filter, PP Sediment Filter, and Inline Filter Cartridge by CFS by Maili Silcox

I paid the retailer $79 for a nearly identical product until I poked fun and found these replacement filters at Revain for a fraction of the price. My sink had to remove the bottom gasket on two of the filters as they were a hair longer than the ones I had previously used and would otherwise not fit the cartridges which is the only reason I gave it four stars instead of five have.