Water treatment device, including: an outlet pipe for treated water, designed for feeding a swimming pool or a Jacuzzi downstream of said pipe; an ozone generator arranged for generating ozone and for feeding same into a water flow at a first feeding point; an ozone destroyer using ultraviolet rays, which is arranged for reducing the ozone content in the water after its treatment with the ozone fed at the first feeding point; characterized by: a second ozone feeding point enabling ozone to be fed into a water flow that reaches said outlet pipe and the swimming pool or Jacuzzi without passing through the ozone destroyer; a water pump for pumping water in a pipe; a first electric valve for feeding the water from said pipe towards said first feeding point; a second electric valve for feeding the water from said pipe towards said second feeding point; a control device for controlling: - the feeding of ozone at the first feeding point, thereby enabling treated water with a first ozone content to be produced in said outlet pipe, wherein this water is called ozone-poor; - or the feeding of ozone at the second feeding point; wherein the control device makes it possible to switch, at least temporarily, the first electric valve in closed position and the second electric valve in open position so as to produce in said outlet pipe and in the swimming pool or the Jacuzzi downstream of said pipe water with a second ozone content greater than the first content, this water being called ozone-rich, wherein the device comprises a timer that controls the closing of the second electric valve and the opening of the first electric valve, allowing an automatic return to a feeding of ozone at the first point after a predetermined duration, or a button allowing in a single manipulation the closing of the second electric valve and the opening of the first electric valve. an outlet pipe for treated water, designed for feeding a swimming pool or a Jacuzzi downstream of said pipe; an ozone generator arranged for generating ozone and for feeding same into a water flow at a first feeding point; an ozone destroyer using ultraviolet rays, which is arranged for reducing the ozone content in the water after its treatment with the ozone fed at the first feeding point; a second ozone feeding point enabling ozone to be fed into a water flow that reaches said outlet pipe and the swimming pool or Jacuzzi without passing through the ozone destroyer; a water pump for pumping water in a pipe; a first electric valve for feeding the water from said pipe towards said first feeding point; a second electric valve for feeding the water from said pipe towards said second feeding point; a control device for controlling: - the feeding of ozone at the first feeding point, thereby enabling treated water with a first ozone content to be produced in said outlet pipe, wherein this water is called ozone-poor; - or the feeding of ozone at the second feeding point; - the feeding of ozone at the first feeding point, thereby enabling treated water with a first ozone content to be produced in said outlet pipe, wherein this water is called ozone-poor; - or the feeding of ozone at the second feeding point;