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This NU Aqua 5 micron carbon block filter is a direct replacement for the NU Aqua Whole House Water Filtration System. This filter is 4.5” x 20” and will directly work with most standard whole-home 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.