This listing is for a replacement pack of Reverse Osmosis Pole Fed filters. This pack contains 6 x 20" PP Sediment 5 Micron Filter and 6 x 20" CTO 5 Micron Carbon Block. Please note that these are 20" filter cartridges and not 10" which are used on standard domestic reverse osmosis units. 20" PP 5 micron Slimline spun sediment filter The PP filter cartridge which is made of polypropylene, can remove the particles, impurities and dust in the water. Filtration precision: 5 micron. Dimension: 20" x 2.5" Capacity/lifespan: 32,000 litres 20" CTO Coconut Carbon Block Filter Coconut Carbon which is more efficient than standard carbon block or Granular Activated Carbon. Used in all reverse osmosis systems with 20" housings; also used on its own in a 20" filter housing, for single stage water filtering for drinking water. The CTO filter cartridge is suitable for the water treatment for removing the chlorine, taste and odour. Filtration Precision: 5 Micron Dimensions: 20" x 2.5" Capacity/lifespan: 29,000 litres.