Aquatic Life Reverse Osmosis Deionization (RODI) 10-Inch Filter Bundle Includes: (1) 5-Micron dual density gradient Sediment Pre-filter cartridge, (1) 5-Micron Carbon Block Pre-Filter cartridge, (1) Color Indicating Mixed Bed Resin DI Cartridge. 5-Micron dual density gradient sediment filter is highly recommended due to longer life and cost effectiveness. Precision manufactured from 100% pure Polypropylene fibers. The fibers have been carefully spun together to form a true gradient density from outside to inside surfaces. 9-7/8" standard size cartridge is self-sealing for a tight fit in RO units. 5-Micron carbon block pre-filter is a high-quality replacement for your existing carbon filter and works best with our 1-Micron dual density gradient sediment filter. 9-3/4" Standard size cartridge includes rubber gaskets at both ends to ensure 100% water flow-through. Color Changing Mixed Bed DI Cartridge is the most effective and easy to use DI cartridge available - filled with Aquatic Life Mixed Bed Resin. Cation and Anion resins (H+ and OH-) remove the remaining total dissolved solids (TDS) from membrane-filtered water. 10" standard cartridge size includes a top gasket for a secure fit, and NEW Cartridge housing shape lends itself to efficient water-to-resin contact, and NEW Opaque cartridge takes the guess work out of determining when resin is exhausted. Color Changing Resin changes from blue to tan when depleted. Item 330234.