The antibacterial plate incorporated in the base unit water tank component is a special metallic plate that exhibits antibacterial effects through catalytic reaction with water.
The antibacterial plate does discolor when used continuously, but this only proves that the antibacterial effect is at work.
This does not affect the antibacterial performance of the unit, which can be used as is.
Remove contamination on the antibacterial plate when cleaning according to the procedures described in the instruction manual to ensure sufficient antibacterial performance.
(Do not use anything other than neutral detergent when using any type of cleansers; using cleansers other than neutral detergent (acidic: citric acid or the like; alkali: mold removing detergents) causes the antibacterial plate to react further, causing darkening.)
To prevent the risk of deteriorating the antibacterial effectiveness of the plate, do not pour anything other than tap water in the water tank.