Kit of 3 filters for reverse osmosis water purifier and in-line under-sink filters. Original for all versions with 10″ containers of any color. Specific for accumulation and continuous cycle purification systems. 1st filter: PP sediment cloth cartridge 20 Micron, removes sand, rust, suspended particles. 2nd filter: PP sediment cloth cartridge 5 Micron gradient fabric, removes sand, rust, suspended particles. 3rd filter: CTO (Carbon Block Filter) 5 Micron activated carbon cartridge (contains silver ions in their active form), able to remove organic substances, chlorine and pesticides.