water cathodic water the first housing 1 includes a first hold plate 11 disposed outermost a first support plate 13 disposed on the inner side of the first hold plate 11 and a first sheet 12 disposed between the first hold plate 11 and the first support plate 13 the first support plate 13 is provided with a first gasket 14 on the inner surface the first gasket 14 has a through hole accommodating space 144 which contains a first cushion 15 the anode 32 and a grating 34 the first hold plate 11 has a disk shape and should preferably be composed of for example a plastic material the first hold plate 11 has an anodic supplying path 111 and an anodic discharging path 112 that penetrate through the first hold plate 11 from one side to the other side the anodic supplying path 111 receives an inserted anodic supplying pipe 91 for supplying feed water from the outside to the anode 32 the anodic discharging path 112 receives an inserted anodic discharging pipe 92 for discharging the resulting water ozonated water to the outside a plurality of bolt openings 113 are disposed at regular intervals around the anodic supplying path 111 and the anodic discharging path 112 the first hold plate 11 further has three pusher openings 114 disposed at regular intervals in the center of the first hold plate 11 the pusher openings.