The system consists of a three-tower fluidized bed and a gravity-free valveless filter. The LWLN series three-tower and four-tower fluidized bed is a new type of ion exchange equipment. The invention of LWLN series fluidized bed has set off a technological revolution of ion exchange equipment, breaking through the traditional process of bed regeneration and cleaning of ion exchange equipment such as fixed bed and moving bed, which greatly simplifies the process of water treatment and is rapidly applied. Soft water treatment in all walks of life. ZWG series gravity type valveless filter treats 10~180 tons of water per hour. It is mainly used for side filtration treatment of circulating cooling water, surface water purification, groundwater removal of iron and manganese, production of wastewater to remove suspended debris, and organic sewage. Subsequent filtration after biochemical treatment of secondary sedimentation tank treatment