A CDI type water treatment apparatus comprising: a CDI filter unit which discharges purified water in a purification mode for purifying raw water, discharges recycle water in a recycle mode for recycling electrodes (111,112), and includes a water inlet port through which the raw water is introduced and a water outlet port through which the purified water or the recycle water is discharged; a supply unit for supplying the raw water to the CDI filter unit; a dispensing unit for dispensing the purified water to a user; a discharge unit for discharging the recycle water to the outside; a valve unit including a supply valve disposed on a flow path from the supply unit to the water inlet port, a drain valve disposed on a flow path from a downstream side of the supply valve to the outside; and a control unit for controlling opening or closing the valves of the valve unit; wherein the CDI filter unit comprises a first CDI filter and a second CDI filter, wherein the second CDI filter is arranged to perform the purification mode when the first CDI filter is not in the purification mode; wherein the first CDI filter comprises a first water inlet port through which the raw water is introduced and a first water outlet port through which the purified water or the recycle water is discharged, the second CDI filter comprises a second water inlet port through which the raw water is introduced and a second water outlet port through which the purified water or the recycle water is discharged, and the flow path from the supply unit to the water inlet port communicates with both the first water inlet port and the second water inlet port; wherein the valve unit further includes a selection valve for selecting any one of a flow path from the water outlet port to the discharge unit, a flow path from the water outlet port to the dispensing unit, and a flow path from an upstream side of the supply valve to the water outlet port, and the control unit is arranged to perform, when the electrodes (111,112) of the CDI filter unit need to be cleaned, a control for closing the supply valve, selecting the flow path from the upstream side of the supply valve to the water outlet port through the selection valve, and opening the drain valve, the control unit is arranged to perform, in the purification mode, a control for opening the supply valve, selecting the flow path from the water outlet port to the dispensing unit through the selection valve, and closing the drain valve, and the control unit is arranged to perform, in the recycle mode, a control for opening the supply valve, selecting the flow path from the water outlet port to the discharge unit through the selection valve, and closing the drain valve. a CDI filter unit which discharges purified water in a purification mode for purifying raw water, discharges recycle water in a recycle mode for recycling electrodes (111,112), and includes a water inlet port through which the raw water is introduced and a water outlet port through which the purified water or the recycle water is discharged; a supply unit for supplying the raw water to the CDI filter unit; a dispensing unit for dispensing the purified water to a user; a discharge unit for discharging the recycle water to the outside; a valve unit including a supply valve disposed on a flow path from the supply unit to the water inlet port, a drain valve disposed on a flow path from a downstream side of the supply valve to the outside; and a control unit for controlling opening or closing the valves of the valve unit; wherein the CDI filter unit comprises a first CDI filter and a second CDI filter, wherein the second CDI filter is arranged to perform the purification mode when the first CDI filter is not in the purification mode; wherein the first CDI filter comprises a first water inlet port through which the raw water is introduced and a first water outlet port through which the purified water or the recycle water is discharged, the second CDI filter comprises a second water inlet port through which the raw water is introduced and a second water outlet port through which the purified water or the recycle water is discharged, and the flow path from the supply unit to the water inlet port communicates with both the first water inlet port and the second water inlet port; wherein the valve unit further includes a selection valve for selecting any one of a flow path from the water outlet port to the discharge unit, a flow path from the water outlet port to the dispensing unit, and a flow path from an upstream side of the supply valve to the water outlet port, and the control unit is arranged to perform, when the electrodes (111,112) of the CDI filter unit need to be cleaned, a control for closing the supply valve, selecting the flow path from the upstream side of the supply valve to the water outlet port through the selection valve, and opening the drain valve, the control unit is arranged to perform, in the purification mode, a control for opening the supply valve, selecting the flow path from the water outlet port to the dispensing unit through the selection valve, and closing the drain valve, and the control unit is arranged to perform, in the recycle mode, a control for opening the supply valve, selecting the flow path from the water outlet port to the discharge unit through the selection valve, and closing the drain valve.