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This NU Aqua Granular Activated Carbon Filter or GAC filter is a direct replacement for the NU Aqua Platinum Series Reverse Osmosis System. This filter is 2.5” x 10” and will directly work with most standard systems. Manufactured using HydraCoil technology these filters provide a higher absorption rate due to the molecular structure of the pores becoming more permeable which allows even the smallest of particles to be efficiently removed from your water. With a ten times chlorine absorption capacity these filters are the premier carbon block filter on the market.