RO Membrane and Filter Kit Only Choice of 24 or 36 GPD NSF/ANSI tested and certified to standard 58 Five Stages of Filtration 1. 2) 5-Micron Sediment Filter: Reduces dirt, Sand, and Rust 2. 2) 5 Micron Carbon Block Filter: Reduces chlorine taste and odor 3. High Production RO Membrane: separates clean water from the rejected impurities down to 1/10,000 of a micron. Choose 24 or 36 5. 2) Final (GAC) Filters.