Aquatic Life TFC RO Membrane Plus Reverse Osmosis Deionization (RODI) 10" Replacement Filter Kit (Sediment Cartridge, Carbon Cartridge, Color Indicating DI Cartridge with ResinTech MBD-30-NG Resin) For Kent Marine, Seachem, Spectrapure, and all RO or RO/DI units that use standard Membranes & 10 cartridges. Kit Includes: (1) 50-GPD Membrane Cartridge, plus (1) 1-Micron Pre-Filter Cartridge for Standard RO Systems, and (1) 5-Micron Carbon Block Pre-Filter Cartridge for Standard RO Systems, plus (1) 10" Color Indicating Resintech MBD-30-NG Nuclear Grade Resin Cartridge for Standard DI Systems. Our DI Cartridge is filled with Resintech MBD-30-NG Nuclear Grade color changing mixed bed resin.