| 摘要 |
PROBLEM TO BE SOLVED: To provide a urinal washing system preventing the adhesion of urolith and the occurrence of malodor in a trap part of the urinal and suppressing the adhesion of urolith also in a drain pipe. SOLUTION: A shield constituting a trap part is submerged in trap water, and wash water containing silver ion is discharged in a time zone when bacteria breed at night.
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