This NU Aqua 5 micron carbon block 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.