The AquaFX Blue Fin RO/DI Filter Set is a comprehensive replacement kit designed to maintain the optimal performance of your reverse osmosis deionization water purification system. This set effectively removes impurities from tap water, including sediment, chlorine, and total dissolved solids, ensuring your aquarium receives ultra-pure water essential for a healthy reef environment. This essential filter set includes a high-quality 1-micron sediment filter (10" x 4"), an AquaFX Chlorine Guzzler carbon block filter (10" x 4"), and a premium Mix-Bed DI filter. The deionization resin is proudly made in the USA, featuring nuclear-grade, virgin resin for superior purification. While compatible with most RO/DI systems, this set specifically provides replacement cartridges for AquaFX Blue Fin Light-Commercial RO/DI systems and does not include the membrane. This filter set is ideal for saltwater aquarium enthusiasts and reef keepers who rely on an RO/DI system for their water needs. By replacing your filters with this convenient set, you ensure consistent water purity, protect sensitive aquarium inhabitants, and prolong the life of your RO membrane. It offers a cost-effective solution for maintaining peak performance of your water purification system.