5 Stage Reverse Osmosis FULL Replacement Water Filter Kit with 50 GPD Membrane FEATURES 10-Inch Sediment filter, 10-Inch Carbon block filter, 10-Inch Granular activated carbon filter, 10-Inch Inline polishing filter & 50GPD NSF Certified Membrane KEEPS WATER FRESH - Reduces sediment, scale, rust, dirt, coarse sand, sand, fine sand, extra fine sand, silt IDEAL for a standard Reverse Osmosis Water Filtration Unit or any type of Water Filtration Unit with 10" housing FILTER LIFE 4 month or 12,000 gallons: Replace two or three times a year, depending on the water quality MEETS NSF STANDARDS and REGULATIONS Inline Coconut Grade Activated Carbon Filters THOSE FILTERS ARE FOR a Standard Reverse Osmosis Water Filtration Unit or any type of Ice Machines, Water Coolers RV &amp; Many Other Applications LIFETIME: REPLACE every 2 years, depending on the water quality This Filter Is Wrapped &amp; Sealed &amp; Meets NSF Standards and Regulations DIMENSIONS: 10&#034; X 2&#034;