The utility model discloses a filter core and water treatment facilities who has it, the filter core includes: strain the shell outward and strain the shell in with and strain the shell in, and establish to strain in, strain the shell outward in and be equipped with the filter media in the shell in order filtering the raw water and strain the shell in, and shell between inject an outer flow channel with straining outward the bottom of straining the shell in, and have a first water through -hole of crossing the top of straining the shell in, and have and cross the water through -hole with the second of outer flow channel intercommunication, wherein, the raw water follow the first water through -hole of crossing gets into interiorly filter and pass through in straining the shell the second is crossed the water through -hole and is discharged extremely outer flow channel, perhaps, the raw water passes through outer flow channel follows the second is crossed the water through -hole and is got into interiorly filter and pass through in straining the shell the first water through -hole of crossing is discharged. According to the utility model discloses a filter core, simple structure, ingenious, the operational reliability is high, and processing is convenient, low in production cost.