The wire-wound hive element or melt blown element is installed inside the fine filter which is applicable to filtration of drinking water, domestic water, industrial water in electronics, printing and dyeing, textile manufacture and environmental protection, as well as filtration of alcohol, medicine, acid and alkali, pre-safe RO membrane. This filter has a large capacity with low cost of material. The external surface is polished or matt finished while the internal surface is passivated by acid. The inlet and outlet of drain pipe are equipped with automatic control valves and controllers, and could conduct automatic back flushing.